Tolerates almost any soil type. Selected from Cedros Island (Baja CA) by Carol Bornstein & Elizabeth Collins, santa Barbara Botanical Garden.

Tolerates almost any soil type. Selected for the garden. Introduced by Tree of Life.

Island Snapdragon (Gambelia speciosa) is a somewhat vine-like perennial plant native to the Channel Islands and to Guadalupe Island, Mexico. It has trumpet-shaped red flowers that attract birds, especially hummingbirds. Under the right conditions it can bloom almost year round.

Island Snapdragon is easy to grow, fast growing and beautiful, a perennial widely available in native California nurseries. It prefers sun or part shade (more shade inland), but you will get more flowers in full sun. It likes rocky slopes and seaside conditions and will tolerate a variety of soils. It tolerates occasional summer water, up to twice a month. Good in containers, and hummingbirds are attracted to the flowers and the plant is a larval food source for the Checkerspot butterfly. 

It was formerly categorized under the genus Galvezia, and some sources still list it that way. 'Firecracker' is a popular horticultural variety.

Tolerates almost any soil type. Prefers sun or part shade in coastal sites, and part shade in inland sites. Selected for the garden.

Horticultural selection from Gambelia speciosa. This selection boasts the bright red flower of its parent Galvezia speciosa but with a bushier, more compact habit. This is a versatile plant for borders, containers, banks or under larger native shrubs. It is a great plant to have under oak trees and is a favorite with hummingbirds. For the lushest growth you should soak deeply occasionally.

Horticultural selection G. Speciosa: origin = seedling (1984) selected from trials; intro Tree of Life Nursery. Tolerates almost any soil type. Prefers sun or part shade in coastal sites, and part shade in inland sites. Selected for use in the garden; introduced by Tree Of Life Nursery.

Horticultural selection from Gambelia speciosa. Tolerates almost any soil type. Prefers sun or part shade in coastal sites, and part shade in inland sites. Selected for the garden.

Garrya buxifolia is a species of flowering shrub known by the common names dwarf silktassel and boxleaf silktassel. It is native to Oregon and northern California, where it grows in forests and chaparral, especially in the coastal mountains and hills. This is an erect shrub approaching three meters in maximum height and generally not sprawling very wide. It has a thick foliage of oval-shaped leaves, each several centimeters long and about half as wide, green and shiny on the upper surface and paler and hairy on the underside. The flower cluster is a long, hanging cluster of flowers. The shrub is dioecious, with male and female plants producing similarly arranged flower clusters. Female flowers give way to hanging bunches or small clusters of fruits. The fruit is a spherical berry which is green when young and turns reddish to dark bluish-purple when ripe.

Garrya congdonii or Congdon silktassel, a fairly common evergreen shrub native to the coastal ranges of California, is one of a small biological family of approximately twenty known species in the family Garryaceae, most of which are Garrya. While the female and male sexual organs of Congdon silktassel are on separate plants, the pendant male catkins are much more showy. This plant is reasonably attractive and neat enough in its growing habit to be appealing as a landscape species. It is stocked commonly at commercial plant nurseries. All Garrya are associated with warm temperate regions of North America. Congdon silktassel has a multi-furcate trunk branching structure yielding an almost spherical form. The height can attain four meters, but more commonly averages two to three meters in the wild. Congdon silktassel, as all the genus Garrya, have opposite leaves that have a tough leathery feel, glossy green on top, but paler, slightly furry and duller on the underside. The dioecious flowers are concentrated in flower clusters which cascade downward as aments of approximately three to five centimeters in length. While the Congdon silktassel manifests separate male and female plants, the pendant male catkins are much more evident, up to 25 centimeters long; those of the female are shorter and silver-grey. Although the flowers bloom in late January and February, dried leafs remain on the tree well into summer as light gray decorations. The plant has smooth dark bark, dark-greenish when young, but with age the bark roughens. New twigs are green and moderately stout.

Coast silktassel (Garrya elliptica) is an evergreen shrub that flowers in January or February, with very long flower clusters that cascade downward as catkins. The pendant male catkins are much more showy. They are about a foot long and grey-green. The female catkins are shorter and silver-grey. The leaves have a tough leathery feel, glossy green on top and remain year round. This shrub also has a dense and tidy form, growing moderately fast to about 12 feet tall and 6 to 10  feet wide. 

It takes full sun, except in hot inland locations where it likely will need some shade, and infrequent to occasional summer water. It prefers well-draining soil but tolerates clay and serpentine soil. It makes a great informal hedge or small tree and can be cut back (espaliered) to grow almost flat against a wall or fence. 

Horticultural selection from Garrya elliptica. This large shrub has beautiful creamy white catkins that appear during the spring. It would make a great option for a bird garden because of the denser foliage than other tassel bushes. This shrub-like appearance and white catkins make it an appealing option for larger plants in a bird garden. Grows best in sandy, coarse-grained or other fast draining soil. Prefers sun or part shade in coastal sites, and part shade in inland sites. Selected for the garden.

Horticultural selection from Garrya elliptica. This large shrub or small tree produces long, showy flower tassels up to 12' in length in winter. Its spectacular flower show, combined with sturdy evergreen foliage and a tolerance of pruning make this a popular landscape specimen. It is ideally suited to the coast, which is its natural environment but will tolerate inland planting, where some light or partial shade is recommended. Plant in well draining soil and add some supplemental water. You should expect a mature height of around 12' and a similar spread in a garden situation in southern California.
Horticultural selection G. elliptica: origin = cuttings (19__) by James Roof, Prairie Creek state Park, Humboldt Co.; intro saratoga Horticultural Foundation. Tolerates almost any soil type. Prefers sun or part shade in coastal sites, and part shade in inland sites. Selected for the garden.

Garrya flavescens is a species of flowering shrub known by the common name ashy silktassel. It is native to the southwestern United States, and Baja California and Chihuahua in Mexico, where it grows in many habitats, including dry forest, desert, and chaparral. This is a shrub reaching a maximum height approaching three meters. The leaves are oval-shaped, up to 7 or 8 centimeters long and about half as wide. The underside may be hairless to very hairy and pale dusty gray. The plant is dioecious, with both male and female plants producing long hanging clusters of flowers. Female flowers give way to bunches or clusters of spherical berries covered in hairs.

Garrya veatchii is a species of flowering shrub known by the common names canyon silktassel and Veatch silktassel. It is native to the chaparral hills of southern California and Baja California. This is a small treelike or bushy shrub reaching maximum heights near two meters. It has oval-shaped leaves 3 to 9 centimeters long and about half as wide with margins flat, wavy, or slightly rolled, and undersides covered thinly to thickly in woolly hairs. It produces long, hanging flower clusters of light-colored flowers, those on female plants giving way to hanging clusters of fruits. The fruit is a spherical to egg-shaped berry covered in a soft coat of hairs.

Gaultheria humifusa is a species of shrub in the heath family which is known by the common names alpine wintergreen and alpine spicy wintergreen. It is native to western North America, from British Columbia to California to Colorado, where it grows in moist subalpine mountain forests. It is a low, spreading shrub which may be quite small, forming flat patches on the ground or amongst rock and leaf litter. The stems are less than 20 centimeters in length and have small oval-shaped leaves one to two centimeters long. It bears solitary bell-shaped flowers with white to light pink corollas and golden anthers which, after pollination, mature into bright to dull red berrylike fruit capsules. The leaves and fruit of Gaultheria humifusa are edible.

Gentiana plurisetosa is a rare species of gentian known by the common names Klamath gentian and bristly gentian. It is native to southern Oregon and northern California, where it is an uncommon resident of wet mountain habitat. This is a perennial herb growing two or more stems which may lie close to the ground or grow erect up to 40 centimeters. Leaves are distributed evenly along the stems and are generally round to oval-shaped and sometimes pointed, up to six centimeters long and half as wide. Flowers are solitary or appear in bunched flower clusters of up to five. Each flower is bright deep blue, up to 5 centimeters long and 3 wide at the mouth, with frilly, thready corolla lobes. The fruit is a capsule containing winged seeds.

Gentiana sceptrum is a species of gentian known by the common name king's scepter gentian. It is native to the west coast of North America from British Columbia to northern California. It grows in wet areas in the hills and mountains, such as flooded meadows and bogs. This is a perennial herb with stems growing along the ground or erect and approaching a meter in height. The stems are leafy, with each oval-shaped leaf several centimeters long and about half as wide. Flowers are solitary or clustered in flower clusters of several. Each flower is four to five centimeters long and two or three wide at the mouth when open. The corolla is dark blue to purple with pointed lobes. The fruit is a capsule containing seeds with small wings.

Gentianella amarella (the autumn gentian or autumn felwort) is a species of the genus Gentianella. It is a short biennial plant with elliptical to lanceolate leaves. The flowers are purplish bells between 12 and 22 mm long. It flowers between July and September. Its habitat is in grass, often on lime-rich soil (in England typically on chalk). It is found throughout Northern Europe.

Autumn Dwarf Gentian (Gentianella amarella ssp. acuta) is a native annual herb that grows in northern, southern and central California. It tends to grow in wet meadows and bogs, at elevations from 4500-11000 feet.

For other uses, see Desert Sunflower (disambiguation). Geraea canescens is also known as the desert sunflower, hairy desert sunflower, or desert gold. It is a dicot and annual of the Aster (Asteraceae) family. "Geraea" in its scientific name comes from the Greek geraios ("old man"), referring to the white hairs on the fruits.

Geraea viscida is a species of flowering plant in the daisy family known by the common name sticky geraea, or sticky desertsunflower. It is native to southern California, mainly the chaparral hills of eastern San Diego County, and northern Baja California. This is a bristly, hairy perennial geophyte producing scrubby stems reaching anywhere from 30 centimeters to nearly a meter in height. The slightly hairy leaves are several centimeters long and generally oval-shaped, sometimes with small teeth and basal lobes. The flower cluster holds one or more flower heads which are knobby clusters of yellow disc florets with no ray florets. The phyllaries surrounding the flower head are particularly sticky. The fruit is an achene up to a centimeter long, not including its pappus hairs.

Geranium californicum is a species of Geranium known by the common name California cranesbill. It is endemic to California, where it grows in the Sierra Nevada and coastal ranges in the southern part of the state. This is a perennial herb topping half a meter in maximum height. Its thin, hairy stems have many wide, palmate leaves divided into several segments which are subdivided into small lobes. Flowers appear singly or in pairs on small stalks. Each has five pointed sepals beneath five rounded to oval-shaped petals which may have slight notches in the ends. The petals are up to 1.5 centimeters long and white to pale pink or lavender with deeper lavender veining.

Geranium viscosissimum, commonly known as the sticky purple geranium, is a perennial in the Geraniaceae family of flowering plants. It is thought to be a protocarnivorous plant. In his 1999 journal article, G.G. Spomer tested several plants in the Pacific Northwest for the carnivorous syndrome, using the digestion of proteins as the diagnostic tool to determine which plants appeared to produce protease enzymes capable of breaking down potential prey. Geranium viscosissimum displayed a capability to digest and absorb the 14C-labeled algal protein placed on the sticky trichomes that the plant possesses. However, it is not known whether the digestive enzymes were produced by the plant itself or surface microbes. Additionally, some definitions of carnivory require the plant to gain some tangible benefit in capturing and digesting prey, such as increased seed yield or growth. Such an experiment has not been done with this species.

Geum triflorum, (three-flowered avens, old man's whiskers, or prairie smoke) is a spring perennial herbaceous plant of North America from northern Canada to California and east to New York. Some Plateau Indian tribes used three-flowered avens to treat tuberculosis.

The annual flowering plant Gilia achilleifolia is known commonly as California gilia, California gily-flower , and blue gilia. It is native to California but grows in other areas of North America where it has been introduced. The plant is erect with long stems that bear bunches of funnel-shaped lavender flowers. It is a member of the phlox family.

California Gilia (Gilia achilleifolia ssp. achilleifolia) is a native annual herb that grows in Southern and Central California, primarily in the SF Bay, the South Coast Range and South Coast regions. It tends to grow in grassy places in sandy or rocky soil, at elevations from 200-3900 feet.

Gilia capitata is a species of flowering plant in the Polemoniaceae (Phlox) family known by the common names bluehead gilia and blue field gilia. It is native to much of western North America from Alaska to northern Mexico, and it can be found on the eastern side of the continent as an introduced species. In California it is widespread, occurring along the coast and in the Sierras. It grows in many habitats, especially in sandy or rocky soils. This wildflower is somewhat variable in form and appearance, with eight recognized subspecies. The branching, leafy stems reach anywhere from 10 to 90 centimeters in maximum height and sometimes having hairy hairs on the fleshy herbage. The leaves are divided into toothed or lobed leaflets. Atop the branches of the thick stem are spherical flower clusters of 50 to 100 small flowers. Each flower has a throat opening into a spreading corolla which may be white, pink, lavender, or light blue. The stamens protrude slightly from the flower's mouth and are white with white, blue, or pink anthers. In the garden it is best use in a meadow-like setting with other annuals. It is frequently included in wildflower seed mixes.

Dune Gilia (Gilia capitata ssp. chamissonis) is a rare native annual herb that grows in Central and Northern California, primarily in the Central Coast region. It tends to grow in open and sandy rocky places, at elevations from 0-600 feet.

Gilia leptantha is a species of flowering plant in the phlox family known by the common name fineflower gilia. It is native to California and southern Nevada, where it grows in open mountain and desert habitat. It is a small, mostly erect herb with a hairy stem often coated in cobwebby fibers. The leaves are arranged in a rounded basal rosette, each leaf divided sharply into many subdivided lobes. The top of the stem is an flower cluster of a few pink to lavender flowers with yellow and white throats. The base of the flower is a thin, hairy tube.

Purpus' Gilia (Gilia leptantha ssp. purpusii) is a native annual herb that grows in Southern and Central California, primarily in the Sierra Nevada Foothills and High Sierra Nevada regions. It tends to grow in open rocky or sandy places, at elevations from 2300-8500 feet.

Gilia nevinii is an uncommon species of flowering plant in the phlox family known by the common name Nevin's gilia. It is known only from the Channel Islands of California and Guadalupe Island off Baja California, where it grows in seaside canyons and flats. This is an erect herb with a hairy stem up to about 40 centimeters tall lined with deeply lobed leaves. The hairy flower cluster produces yellow-throated lavender flowers 8 to 14 millimeters wide, each with protruding stamens tipped with blue anthers.

Tricolor gilia (Gilia tricolor) is an annual with a long blooming period. Starting in spring, each plant produces hundreds of half-inch white flowers with blue or lavender edges.  Though small, these flowers look very pretty when massed. They grow on upright stems, about 18 inches tall, surrounded by soft, lacy foliage.

This plant is very easy to grow. It takes full sun, low water and tolerates many different types of soil including clay. It can be planted from seed and re-seeds itself the next spring reliably, and is very attractive to native bees, butterflies, and other beneficial insects. Tricolor gilia is also known as bird's-eyes, bird's-eyes gilia. If you sow related but different types of gilia together they will hybridize. 

Glehnia littoralis is a species of plant in the carrot family known by several common names, including beach silvertop and American silvertop in English, and bei sha shen (Chinese: ') and shan hu cai (Chinese: ) in Chinese. The genus was named after Russian botanist Peter von Glehn. It is native to eastern Asia, particularly eastern China, Japan, and far-eastern Russia, and western North America from Alaska to northern California.

Glyceria borealis is a species of mannagrass known by the common names northern mannagrass, boreal mannagrass, and small floating mannagrass. It is native to much of the northern half of North America, where it has a widespread distribution. This semiaquatic plant grows in wet areas in mountain forests, often in the water. It grows a tall and very thin stem often exceeding a meter in height when erect. It may bend, lie flat on the ground, or float in the water of ponds and streams. The leaves bear ligules up to a centimeter long. The narrow, long flower cluster has cylindrical spikelets one to two centimeters long, each made up of 6 to 11 florets with membranous margins.

Fowl Mannagrass (Glyceria elata) is a native grass that grows in central and northern California. It tends to grow in shallow water and muddy shores, at elevations from 0-7000 feet.

Glyceria grandis is a species of mannagrass known by the common name American mannagrass. It is native to Canada and the United States, where it is widespread in distribution. It is most commonly found in wet areas such as riverbanks and ponds. This is a rhizomatous perennial grass bearing thin stems which approach two meters in maximum height. The sturdy leaves each have a prominent central vein. The tops of the stems are occupied with spreading, multibranched flower clusters bearing many small, oval-shaped spikelets.

Glyceria striata is a species of mannagrass known by the common names fowl mannagrass and ridged glyceria. It is native to much of North America, from Alaska and northern Canada to northern Mexico. It is a common species found in wet areas, often in forests. It bears erect stems exceeding a meter in maximum height and firm, narrow leaves. The spreading branches of the flower cluster hold oval-shaped to nearly round spikelets each with generally fewer than six florets.

American Licorice (Glycyrrhiza lepidota) is a species of Glycyrrhiza native to most of North America, from central Canada south through the United States to California, Texas and Virginia, but absent from the southeastern states. It is also sometimes known in the United States as "wild licorice", to distinguish it from the related European Liquorice (Glycyrrhiza glabra) which is occasionally cultivated. The plant grows in moist soils; although it will grow in heavy soil it prefers sandy soil. It grows to 40-100 centimeter (16-40 inches) tall, and has long tough brown roots which are said to be sweet and were used as food and for medicinal purposes by Native Americans. American Licorice is not sweet from sugar but from glycyrrhizin, the acid ammonium salt of the tri-basic acid, glycyrrhizic acid. Glycyrrhizin may increase blood pressure (aka hypertension) by interfering with cortisol conversion.

This plant slowly spreads by rhizome to form large patches. Bumblebees are attracted to the flowers, and this plant is a host for several butterfly plant. Wild licorice is a rare in native plant gardens, but has lots of value for wildlife, does great in heavy soils, and is tolerant of both shade and full sun. It grows well with other riparian forest species like Leymus triticoides and Carex barbarae.

Grayia is a monotypic genus of plants containing the sole species Grayia spinosa, which is known by the common names hop sage and spiny hop sage. This plant is widely distributed across the western United States, where it grows in a number of desert and mountain habitats. It is a small, multibranched, brambly shrub generally under a meter in height. The grayish branches have spiny, pointed ends and stiff twigs. During the growing season the branches are covered in small oval-shaped, flat to scooplike leaves mostly under 3 centimeters in length. The shrub is dioecious, with male individuals flowering in clumps of a few flowers surrounded by leaflike leafs, and female individuals producing flower clusters of bright pink, yellow, or white fruiting leafs surrounding tiny petalless pistillate flowers. Female flower clusters are much larger than male and make the plant one of the more colorful shrubs in the springtime habitat. The fruit is a utricle only a few millimeters wide. The shrub sheds its leaves and flowers by the summer in hot or dry areas and becomes a woody gray thicket; it is evergreen in some regions. The genus was named after the botanist Asa Gray.

Grindelia camporum is a species of flowering plant in the daisy family known by the common names Great Valley gumplant and Great Valley gumweed. The plant is native to California and Baja California, where it can be found in a number of habitats including chaparral and woodlands. Its range may extend into Nevada. It is hardy plant that also readily grows in disturbed and altered areas such as ditches and roadsides. Grindelia camporum is a gangly perennial up to 2 m (6 ft. ) in maximum height but usually less. Its erect, branching stems are lined with many stiff, wavy-edged, serrated leaves 2 to 3 cm long. Atop the stem branches are inflorescences of a single large flower head up to 3 cm wide. The head is a vaguely thistlelike cup of green clawlike phyllaries that bend downward. The centre of the head is filled with yellow disc florets and there are usually many yellow ray florets around the circumference. The flower head fills with a copious white exudate, especially during the early stages of blooming. It is a traditional Native American medicinal plant, used by the Indigenous peoples of California and also a major pollinator attractant.

Grindelia hirsutula is a North American species of flowering plant in the daisy family known by the common names hairy gumplant and hairy gumweed. Grindelia hirsutula is native to North America, widespread across Canada and in California and Oregon. The species is highly variable, and many local populations have been named as varieties or as distinct species. All these taxa do, however, intergrade with one another. Grindelia hirsutula is an erect perennial herb or subshrub sometimes as much as 250 cm (100 inches or 8 1/3 feet) tall but usually much shorter. The plant is usually green but the stems are often red or purplish-brown and the leaves can be somewhat yellowish to reddish. The plant can produce numerous flower heads in branching arrays at the top of the plant. Each head is 2 or 3 centimeters (0. 8-1. 2 inches) wide with hemispheric cups of greenish phyllaries around the base, the bracts claw-like and bent away from the flowers. The center of the head is filled with many small yellow disc florets surround by numerous golden ray florets. The head produces a thick white exudate, especially in new flower heads. Varieties: Grindelia hirsutula var. maritima - San Francisco Gum Plant, San Francisco gumplant, coastal gumweed; endemic to coastal California in the San Francisco Bay Area.

Tolerant of recycled water.

Grindelia stricta is a species of flowering plant in the Asteraceae (Sunflower) family known by the common names Coastal Gumweed and Oregon Gumweed. It is native to the west coast of North America from California to Alaska, where it is a resident of coastal plant communities such as those in marshes and beaches. In California it is found from the Channel Islands northwards, typically in close proximity to the coast. There are three recognized Varieties: This plant is variable in appearance, taking the form of a weedlike perennial herb forming low clumps to a sprawling subshrub growing erect to heights exceeding one meter. Its foliage and stems are green to rusty red or purplish and the plant may be hairy to hairless. The fleshy leaves are green, often with red edges and veining, and are up to 15 centimeters in length on large plants. The flower cluster holds one or more flower heads each up to 5 centimeters wide. The flower head is a cup of thick erect or recurved green phyllaries. Yellow disc florets fill the center of the flower head and there is a fringe of yellow ray florets around the circumference. The head produces copious white exudate, especially in the early stages of blooming. This exudate was used by native people as an adhesive.

Marsh Gumplant (Grindelia stricta var. angustifolia) is a native perennial herb that grows in northern, southern and central California. It tends to grow in tidal flats, at elevations from 0-1600 feet.

Gumweed (Grindelia stricta var. platyphylla) is a native perennial herb that grows in Southern and Central California, primarily in the Central Coast region. It is a member of the Asteraceae and has typical sunflower floral structure with yellow disk flowers and ray flowers. It tends to grow in tidal flats, coastal strand, and coastal sage scrub typically very near the ocean, at elevations from 0-700 feet. There are three recognized varieties of Grindelia stricta; var. platyphylla is broadly distributed along the coast from Del Norte County to Los Angeles County and the northern Channel Islands. The flower bud is distinctive in having large amount of sticky white sap which native people use as an adhesive. The plant has a prostrate, sprawling habit and roots as it spreads. It performs best in coastal gardens with sandy soil.

Oregon Gumweed (Grindelia stricta var. stricta) is a native perennial herb that grows in northern, southern and central California. It tends to grow in tidal flats, at elevations from 0-700 feet.

Grusonia parishii (Orcutt) Pinkava is a species of cactus known by the common names matted cholla and Parish club cholla. It is native to the Mojave and Sonoran Deserts of California and Arizona. Grusonia parishii grows in spreading mats along the sandy ground no more than about 20 centimeters tall. The segments are up to 9 centimeters long by 3 wide and is surfaced in fleshy tubercles bearing many spines each up to 5 centimeters in length. The flower is yellowish and the fruit is yellow and up to 8 centimeters long. Synonyms. Grusonia parishii (Orcutt) Pinkava, J. Arizona-Nevada Acad. Sci. 32: 50. 1999. Grusonia stanlyi (Engelm. ex B. D. Jacks. ) H. Rob. , Phytologia 26(3): 176. 1973. Opuntia parishii Orcutt, W. Amer. Sci. 10: 81. 1896. Corynopuntia parishii (Orcutt) F. M. Knuth, Kaktus-ABC 115. 1935. Corynopuntia stanlyi var. parishii (Orcutt) Backeberg, Die Cactaceae 1: 361. 1958. Opuntia stanlyi Engelm. ex B. D. Jackson, Notes of a Military Reconnaissance 157, f. 9. 1848. Opuntia stanlyi Engelmann var. parishii (Orcutt) L. D. Benson, Cacti of Arizona (ed. 2) 39. 1950.

Gutierrezia californica is a species of flowering plant in the Asteraceae (Sunflower) family known by the common names San Joaquin snakeweed and California matchweed. It is native to California and Baja California, where it grows on slopes and plains in a number of habitats. It is found in the Coast Ranges, Transverse Range and Peninsular Range, coming fairly close to the coast in Los Angeles, Orange and San Diego Counties. It is often seen in very arid settings. This is a small subshrub reaching up to about half a meter in height. It grows clumpy or gangly and generally erect stems in shades of gray and red which are lined with small linear green leaves. At the end of each branch of the stem is an flower cluster of one to three small flower heads just a few millimeters wide. The head contains several yellow disc florets with long, protruding styles and several yellow ray florets around the edge.

Gutierrezia sarothrae is a species of flowering plant in the daisy family known by the common names broom snakeweed and perennial matchweed. It is native to much of the western half of North America, from central Canada to northern Mexico. It can be found in a number of desert, grassland, and mountain habitats. This is a small, dense, bushy subshrub reaching maximum heights around half a meter. The multibranched stems and twigs are greenish or tan when young and age to woody brown. There are scattered narrow to thready leaves along the branches. The plant flowers abundantly in flower clusters of a few flowers each. The flower is about a centimeter long and bright golden yellow with a center of a few long, protruding disc florets and a fringe of ray florets. The plant is toxic to livestock in large quantities, due mainly to the presence of saponins and concentrated selenium.

Hackelia bella is a species of flowering plant in the borage family known by the common name greater showy stickseed. It is native to the coastal mountain ranges of northern California and southern Oregon. This sprawling perennial herb grows hairy stems to about half a meter in height. The base of the plant is surrounded by many long, thin oval-shaped leaves up to about 26 centimeters long each. Leaves farther up the stem are similar but shorter and the tops of the stems have few leaves. The small flowers have five lobes with a small petallike appendage at the base of each lobe. The flowers are usually white. The fruit is a nutlet 5 or 6 millimeters wide.

Hackelia micrantha is a species of flowering plant in the borage family known by the common name Jessica sticktight. It is native to western North America from Alaska to northern Mexico, where it often grows in forested areas and meadows. This is a lush perennial herb growing to heights of 30 centimeters to over one meter. Its erect stems are surrounded at the base by many oval-shaped to lance-shaped leaves, the longest over 20 centimeters long. The upper stems are generally leafless and hold cyme flower clusters of bright blue flowers. Each petite flower has five rounded lobes with a smaller petallike appendage at the base of each. The fruit is a nutlet with pointed prickles.

Hastingsia alba is a species of flowering plant known by the common names white rushlily and white shoenolirion. It is native to northern California and southern Oregon, where it grows in wet places such as bogs and mountain meadows. It grows from a black-coated bulb a few centimeters wide and produces erect stems 40 to 90 centimeters tall. There are several long, thin, bending leaves about the base of the plant and the stems are naked. The top of each stem is a dense, pointed flower cluster of many flowers, with smaller flower clusters branching off lower levels of the stem. Each flower is cream or greenish-white with six curly, lilylike petals. Each has six white stamens with large brown anthers. The flowers fall away to leave the fruits, which are green capsules containing black seeds.

Hastingsia serpentinicola is a species of flowering plant known by the common name Klamath rushlily. It is native to the mountains of northwestern California and southwestern Oregon, where it grows in serpentine soils. This is a perennial herb growing from a black bulb 2 to 4 centimeters long and producing an erect stem up to 50 centimeters tall. A number of long, bending leaves surround the stem at its base, and the rest of the stem is naked. The top portion of the erect stem is a narrow, pointed inflorescence of many white or greenish lilylike flowers. Each small flower has six curled perianth parts and six protruding stamens with very large anthers. The flowers fall away to leave the developing fruits, which are capsules a few millimeters wide containing black seeds.

Hazardia cana is a rare species of shrub in the daisy family known by the common name San Clemente Island hazardia, or simply island hazardia. It is native to San Clemente Island, one of the Channel Islands of California, and Guadalupe Island off Baja California. This is a bushy shrub reaching one half to two meters in height. It has woolly, hairy herbage of oblong, sometimes finely toothed leaves 4 to 12 centimeters long. At the ends of its grayish stems it produces cylindrical flower heads. Each flower head has several rows of dark-colored phyllaries and an open end revealing disc florets and longer protruding ray florets. The florets are yellow and may age to red or purple. The main threat to this species on San Clemente Island was the presence of feral goats. The goats were removed from the island and the plant is recovering.

Hazardia detonsa is a rare species of shrub in the daisy family known by the common name island bristleweed. It is endemic to three of the eight Channel Islands of California. This is a bushy shrub reaching 60 centimeters to 2.5 meters in height. It has densely woolly, hairy herbage of thick, serrated, oval-shaped leaves up to 14 centimeters long. At the ends of its whitish stems it produces bell-shaped flower heads each about a centimeter long. Each flower head has several rows of white woolly phyllaries and an open end revealing disc florets and longer protruding ray florets. The florets are yellow and may age to red or purple. The main threat to this species on Santa Cruz Island was the presence of feral Santa Cruz sheep. The sheep were removed, allowing the plant to begin its recovery there.

Hazardia orcuttii is a rare North American species of flowering plant in the aster family known by the common names Orcutt's bristleweed and Orcutt's goldenbush. It is native to California in the United States and Baja California in Mexico. It can be found in one location in California, in the city of Encinitas. There, it is located in and near a protected zone known as the Manchester Conservation Area. In Baja California it can be found at 11 to 17 locations. Hazardia orcuttii is a resinous shrub growing up to 100 centimetres (39 in) tall. The leathery, pointed leaves are up to 5 by 1. 5 centimetres (0. 59 in) in size. The flower head is turbin-shaped and has several ray florets and disc florets surrounded by 40 to 60 resinous phyllaries. The fruit is a few millimeters long and is tipped with a brown pappus about half a centimeter long.

Hazardia squarrosa is a species of shrub in the Asteraceae (Sunflower) family known by the common name Sawtooth Goldenbush. It is native to California and Baja California, where it grows in coastal and inland scrub and chaparral habitats from Monterey County southward. This is a shrub of variable size, from low and clumpy to sprawling over two meters tall. It is covered in thick, sharply toothed leaves a few centimeters long and is generally not very hairy or woolly. It bears discoid flower heads covered in greenish, pointed phyllaries and opening into an array of long yellow to slightly reddish disc florets and no ray florets. There are three recognized varieties with largely overlapping ranges. In the garden it provides long lasting summer color and is popular with many insects including butterflies. Also valuable in restoration projects.