Plantago ovata (Desert Indianwheat, Blond Psyllium; syn. Plantago brunnea Morris, Plantago fastigiata Morris, Plantago gooddingii A. Nels. & Kennedy, Plantago insularis Eastw., Plantago insularis Eastw. var. fastigiata (Morris) Jepson, Plantago insularis Eastw. var. scariosa (Morris) Jepson, Plantago minima A. Cunningham) is a medicinal plant native to Western Asia and Southern Asia. It is a common source of psyllium seed husks, a material used as dietary fiber.

According to a molecular clock analysis by Stephen C. Meyers and Aaron Liston, it was introduced to California 200,000 to 650,000 years ago, so by now can also be safely called a California native.

Plantago patagonica is a species of plantain known by the common name woolly plantain. It is native to much of North America, including the southern half of Canada, the western and central United States, and northern Mexico, and parts of southern South America. It grows in many types of habitat, including grassland and woodlands. It is a hairy annual herb producing linear or very narrowly lance-shaped basal leaves up to 10 centimeters long. There are usually many stemlike flower clusters growing erect to a maximum height around 18 centimeters. Atop the peduncle of the flower cluster is a dense cylindrical or somewhat conical spike of several tiny flowers and leafs. The spike is very woolly.

Plantago rhodosperma is a species of flowering plant in the plantain family known by the common names redseed plantain and redseed indianwheat. It is native to the Great Plains and Southwest of the United States. This species is an annual herb growing from a taproot. The leaves are lance-shaped and may reach 35 centimeters long, but are usually smaller. The leaves are gray-green and lightly hairy. The inflorescence is a narrow spike up to 20 centimeters long. Each small flower produces two red or reddish black seeds.

Plantago subnuda is a species of plantain known by the common name tall coastal plantain. It is native to western North America from the west coast of the United States to west-central Mexico, where it grows in wet and moist habitat types, often in coastal areas, such as marshland. It is a perennial herb producing few oval leaves around a thick caudex. The broad smooth-edged or slightly toothed leaves may be up to 40 centimeters long. The stemlike flower clusters grow erect to a maximum height near half a meter. Atop the peduncle of the flower cluster is a dense cylindrical spike of many tiny flowers. Each flower has a corolla of ephemeral petals about 3 millimeters long.

The Western Sycamore (Platanus racemosa), a species of plane tree native to California, is a tall, distinctive tree that stands out in any landscape. This tree is known for its bark, which is mottled in shades of pale tan, gray, and white. The bark peels as it ages. It has twisting branches and large leaves which turn orange-yellow in the fall. It produces seed balls after blooming. It's an important host plant for the Western Tiger Swallowtail butterfly.

Naturally found in moist areas near rivers and streams, this tree requires a significant amount of water to thrive. When not planted near a water source, it needs regular irrigation. The Western Sycamore tolerates different soil types and does best in full sun. It can grow up to 100 feet tall and 50 feet wide, so be sure to give new trees a large planting area.

Platystemon is a monotypic genus of flowering plants in the Papaveraceae (Poppy) family containing the single species Platystemon californicus, which is known by the common name Creamcups. It is native to the southwestern United States and Baja California, where it is a common spring wildflower in many types of habitat. In California it is found from north to south, along the coast, in foothills, the Coast Ranges, Transverse Range and Peninsular Range. It is populr as an ornamental plant for landscaping and revegetation of recently burned areas. This is an annual herb which is quite variable in appearance. The oppositely arranged leaves are 2 to 8 centimeters long and in shape linear, lance-shaped, or oblong. It is hairy in texture, sometimes with very long hairs. The flower cluster is a single flower on a tall peduncle up to 20 centimeters high. The flower has six petals which may be pure white or golden or white with large gold spots or gold tips. The center of the flower is filled with a tuftlike cluster of many thick, flattened stamens. The fruit is a capsule with several one-seeded sections that break apart. There is one recognized variety, var. ciliatus, which is a rare plant endemic to Santa Barbara Island.

Plectritis ciliosa is a species of flowering plant in the honeysuckle family known by the common name longspur seablush. It is native to western North America from Washington to Baja California and Arizona, where it is a common plant in mountains, valleys, and coastal habitat types. It is an annual herb growing erect to a maximum height between 50 and 80 centimeters. The widely spaced, paired and oppositely arranged leaves are oval or somewhat oblong, smooth-edged, and up to 3 centimeters long by 1 wide. The upper ones lack petioles. The inflorescence is a dense headlike cluster of flowers in shades of bright to pale pink with two darker pink dots on the lower lip. Each flower has a long, slender spur extending downward from the front of the corolla.

Plectritis congesta is a species of flowering plant in the honeysuckle family known by several common names, including shortspur seablush and rosy plectritis. It is native to western North America from Vancouver Island to southern California, where it is a common plant in coastal forests, seashores, mountain meadows, and other habitat. It is an annual herb growing erect 10 to 60 centimeters tall. The widely spaced, paired and oppositely arranged leaves are oval or somewhat oblong, smooth-edged, and up to 6 centimeters long by 2 wide. The upper ones lack petioles. The inflorescence is a dense headlike cluster of flowers in shades of bright pink to nearly white. Each flower has an upper and lower lobed lip under a centimeter in length and three protruding stamens tipped with purple anthers bearing yellow pollen.

Plectritis macrocera is a species of flowering plant in the honeysuckle family known by the common names longhorn seablush and white plectritis. It is native to western North America from British Columbia to Montana to California, where it is a common plant in mountains, valleys, open steppe, and coastal habitat types. It is an annual herb growing erect to a maximum height between 60 and 80 centimeters. The widely spaced, paired and oppositely arranged leaves are oval or somewhat oblong, smooth-edged, and up to 4. 5 centimeters long by 2 wide. The upper ones lack petioles. The inflorescence is a dense, cylindrical, headlike cluster of flowers in shades of pale pink to white. The corolla is under a centimeter long and is divided into five lobes and a short, blunt spur. Media related to Plectritis macrocera at Wikimedia Commons

Pluchea odorata is a species of flowering plant in the aster family, Asteraceae, that is native to the United States, Mexico, Central America, the Caribbean, and northern South America. Common names include Sweetscent, Salt Marsh Fleabane, and Shrubby Camphorweed. It inhabits wetlands and other coastal habitats and moist inland areas, often in saline substrates. It is an introduced species and a noxious weed in Hawaii. It is an annual or perennial herb growing erect to a maximum height over one meter. It is hairy, coated in rough trichomes (hairs), and strongly aromatic. The toothed oval leaves are up to 12 centimeter (4.7 inches) long and alternately arranged on the stiff stems. The flower cluster is a large cluster of many flower heads. Each head is less than 1 centimeter (0.39 inches) long and filled with bright pinkish-purple or magenta flowers. The fruit is a tiny achene tipped with a bristly pappus.

Pluchea sericea, commonly called Arrowweed, is a rhizomatous evergreen shrub of riparian areas in the lower Sonoran Desert and surrounding areas. It is common in the lower Colorado River valley of California, Nevada and Arizona, as far east as Texas, and in northern Mexico where it often forms dense impenetrable thickets. It was once used medicinally by Native Americans as an antidiarrheal and eyewash. Other traditional uses include thatching, arrowmaking and food, especially the edible root.

Poa atropurpurea is a rare species of grass known by the common name San Bernardino bluegrass. It is endemic to southern California, where it is known from two regions, the San Bernardino Mountains near Big Bear and the Laguna Mountains of San Diego County. It grows in wet mountain meadows. It is a rhizomatous perennial grass growing in small, loose tufts up to about half a meter tall. The firm, narrow leaves often have rolled or folded edges. It is a dioecious plant, with male and female individuals bearing different flower types. The flower cluster is somewhat lance-shaped, with branches appressed, spreading upwards along the stem axis. Male and female flower clusters look similar. They may hold up to 70 spikelets each, which are purplish in color. In the San Bernardino Mountains the grass occurs in the pebble plain habitat near Big Bear with other rare plant species. In San Diego County the grass has been observed on Palomar Mountain and in the meadows of Mount Laguna. There are fewer than twenty populations of this grass in existence and it is a federally listed endangered species of the United States.

Poa bigelovii is a species of grass known by the common name Bigelow's bluegrass. It is native to the southwestern United States and northwestern Mexico, where it grows in shady spots in desert and plateau habitat. It is an annual bunchgrass growing in small clumps up to 40 centimeters tall. The inflorescence is a narrow, compact, cylindrical series of hairy spikelets. The spikelets sometimes have a curly tuft of hairs or cobwebby fibers near their bases.

Poa bolanderi is a species of grass known by the common name Bolander's bluegrass. It is native to western North America from British Columbia to Utah to California, where it is a resident of mountain habitat, particularly pine and fir forests. It is an annual grass growing in clumps up to 60 centimeters tall. The inflorescence occupies the top 10 to 15 centimeters of the stem. It is narrow in flower, with branches appressed, growing parallel to the stem. As the fruit develops the branches spread out, becoming perpendicular to the stem, nodding, or drooping. The branches have few, sparse spikelets. Poa bolanderi commemorates Henry Nicholas Bolander, who collected the type specimen in present day Yosemite National Park in 1866.

Poa confinis is a species of grass known by the common names coastline bluegrass and beach bluegrass. It is native to the coastline of western North America from British Columbia to northern California, where it grows on beaches, dunes, and other coastal habitat. Poa confinis is a perennial grass growing in small tufts with rhizomes and stolons, reaching up to about 30 centimeters tall. The narrow leaves are firm to stiff and sometimes folded or rolled along the edges. The inflorescence is a small, rough-haired, light brown cluster of spikelets. The plant is dioecious, with male and female individuals producing different types of inflorescence, the types similar in appearance. Poa confinis is a perennial grass growing in small tufts with rhizomes and stolons, reaching up to about 30 centimeters tall. The narrow leaves are firm to stiff and sometimes folded or rolled along the edges. The inflorescence is a small, rough-haired, light brown cluster of spikelets. The plant is dioecious, with male and female individuals producing different types of inflorescence, the types similar in appearance.

Poa cusickii is a species of grass known by the common name Cusick's bluegrass. It is native to western North America from Yukon to Colorado to eastern California, where it grows in many types of habitat, including high mountain meadows and slopes, sagebrush scrub, and forests. It is a perennial grass growing dense, sometimes large, clumps up to about 60 centimeters in maximum height. The narrow leaves are firm and sometimes rolled along the edges. The longest leaves are located around the middle of the stem. The flower cluster is a dense, narrow series of overlapping branches bearing up to 100 spikelets in total. The grass is dioecious, with male and female individuals producing different types of flowers in their flower clusters. The plant often reproduces vegetatively via tillers, or via apomixis with unfertilized seeds, and some populations are made up only of female individuals. One subspecies, ssp. purpurascens, is all female.

Poa diaboli is a rare species of grass known by the common name Diablo Canyon bluegrass. It is endemic to San Luis Obispo County, California, where it is known from about five occurrences in the San Luis Mountains near the coast. The type specimen was collected in Montaña de Oro State Park and the grass was described as a new species in 2003. The grass occurs on rugged mountaintops and north-facing slopes in thin soils covering shale rock within a few kilometers of the coastline. Its habitat includes chaparral, oak woodland, coastal sage scrub, and Bishop pine forest. This species is a rhizomatous or stoloniferous perennial grass growing in mounds with stems up to half a meter tall. The inflorescence is a panicle of flowers up to 10 centimeters long with upright or spreading branches. It flowers in March and April, the spikelets green with webby fibers.

Poa douglasii is a species of grass known by the common names Douglas' bluegrass and sand dune bluegrass. It is endemic to the coastline of California, where it grows in shifting sand dunes. It can be found mostly along the Central Coast and Channel Islands, and occasionally on the North Coast north of Mendocino. It is a perennial grass growing small, dense clumps up to about 30 centimeters in maximum height. It grows from a network of long rhizomes and stolons that anchor the grass to its loose sandy substrate; this network may be up to one meter long. The inflorescence is a dense, oval-shaped series of overlapping spikelets. The grass is dioecious, with male and female individuals producing different types of flowers in their inflorescences. This species, like many sand-dune endemic plants, is threatened by invasive species.

Muttongrass (Poa fendleriana) is a native grass that grows in Northern, Southern and Central California, primarily in the Desert Mountains and High Sierra Nevada regions. It is moderately fast growing and moderately long-lived. It grows in an upright form to a height of 2 feet, with active growth during the spring. Flowers are yellow and bloom in the early spring. Leaves are medium green and deciduous. It tends to grow in slopes, at elevations from 3200-10200 feet.

Poa glauca is a species of grass known by the common names glaucous bluegrass, glaucous meadow-grass and white bluegrass. It has a circumboreal distribution, occurring throughout the northern regions of the Northern Hemisphere. It is also known from Patagonia. It is a common grass, occurring in Arctic and alpine climates and other areas. It can be found throughout the Canadian Arctic Archipelago in many types of habitat, including disturbed and barren areas. This is a perennial bunchgrass growing small, dense clumps of waxy leaves and stems up to about 80 centimeters in maximum height, but often remaining dwarfed, no more than 10 centimeters tall. The inflorescence is variable in appearance, growing into a short or long arrangement of thin branches bearing spikelets.

Poa howellii is a species of grass known by the common name Howell's bluegrass. It is native to western North America from British Columbia to throughout California. It grows in rocky areas in woodlands and chaparral, as well as disturbed areas. Poa howellii is an annual bunchgrass growing in dense, narrow tufts up to 80 centimeters tall. The inflorescence is a series of whorls of branches bearing spikelets, the branches growing appressed to the stem and then spreading out from the stem as the spikelets mature.

Poa kelloggii is a species of grass known by the common name Kellogg's bluegrass. It is endemic to the North and Central Coasts of California, where it grows in coastal forests, including redwood forests. It is a perennial grass producing single stems or loose clumps of several stems up to 85 centimeters tall. The inflorescence is a series of branches along the stem which spread out and then droop as the fruit matures. The flattened spikelets occur at the tips of the thin branches.

Poa leptocoma is a species of grass known by the common names marsh bluegrass and western bog bluegrass. It is native to western North America from Alaska to New Mexico, where it grows in subalpine and alpine climates and the Arctic. It is also known from the Kamchatka Peninsula. Poa leptocoma grows in moist habitats, including meadows and land next to lakes, ponds, and streams. It is a perennial grass growing in loose clumps with stems up to 2 to 3 feet in maximum height. The inflorescence is a series of branches bearing spikelets, the branches growing appressed to the stem and then spreading out and drooping from the stem as the spikelets mature. The spikelets are green to blue to dark purple in color. Poa leptocoma grows in moist habitats, including meadows and land next to lakes, ponds, and streams. It is a perennial grass growing in loose clumps with stems up to 70 to 100 centimeters in maximum height. The inflorescence is a series of branches bearing spikelets, the branches growing appressed to the stem and then spreading out and drooping from the stem as the spikelets mature. The spikelets are green to blue to dark purple in color.

Poa macrantha is a species of grass known by the common names seashore bluegrass and large-flowered sand dune bluegrass. It is native to the west coast of North America from Alaska to northern California, where it grows in sand dunes and other beach habitat. Poa macrantha is a perennial grass growing in loose clumps with stems up to 60 centimeters in maximum height. The grass grows from a network of very long, stout rhizomes and stolons which may be up to 4 meters in length, anchoring the grass in its shifting sandy substrate. The inflorescence is a dense series of clustered spikelets which are flattened and longer than wide. The plant is dioecious with male and female individuals bearing different types of flowers; the two flower types are similar in appearance.

Poa napensis is a rare species of grass known by the common name Napa bluegrass. It is endemic to Napa County, California, where it is known from only two occurrences near Calistoga. It grows in moist, mineral-rich soil around hot springs. The rare grass only occurs on private, unprotected land and depends on water from the hot springs; changes to the local water regime or any other aspects of its specific habitat type would affect the plant. This grass was federally listed as an endangered species in 1997, along with another rare local hot spring endemic, the Calistoga popcornflower (Plagiobothrys strictus). This is a perennial grass forming dense clumps of somewhat waxy stems up to about a meter in maximum height. The inflorescence is an open array of thin branches bearing rough-haired, flattened, lance-shaped spikelets. The spikelets may be greenish to purple in color.

Poa secunda (variously known by the common names of Sandberg bluegrass, alkali bluegrass, big bluegrass, Canby's bluegrass, Nevada bluegrass, one-sided bluegrass, Pacific bluegrass, pine blugrass, slender bluegrass, wild bluegrass, and curly bluegrass. ) is a widespread species of grass native to North and South America. It is highly resistant to drought conditions, and provides excellent fodder; and has also been used in controlling soil erosion, and as revegetator, often after forest fires. Cultivars include 'Canbar', 'Service', 'Sherman', and 'Supernova'. Historically, indigenous Americans, such as the Gosiute of Utah, have used P. secunda for food. It was originally described botanically in 1830 by Jan Svatopluk Presl, from a holotype collected from Chile by Thaddäus Haenke in 1790.

Rush Blue Grass (Poa secunda ssp. juncifolia) is a common native grass that grows in northern, southern and central California. It tends to grow at elevations from 2600-10000 feet.

One-sided Bluegrass (Poa secunda ssp. secunda) is a common native grass that grows in northern, southern and central California. It tends to grow at elevations from 0-12500 feet.

Poa unilateralis is a species of grass known by the common names San Francisco bluegrass, ocean-bluff bluegrass, and sea-bluff bluegrass. It is native to west coast of the United States from Washington to central California, where it grows in coastal habitats such as bluffs and beaches in sandy saline soils. It is a perennial grass forming dense clumps of stems up to 40 centimeters tall. The herbage may be waxy in texture. The leaves may be thin and early-withering or somewhat fleshy and persistent. The inflorescence is a dense cluster of short branches bearing small, hairy-edged spikelets.

Wheeler's Bluegrass (Poa wheeleri) is a common native grass that grows in northern, southern and central California. It tends to grow in open places with rich soils, at elevations from 4500-12500 feet.

Polygonum austiniae, common name Mrs. Austin's knotweed, is a plant species in the buckwheat family. It is native to western Canada and the western United States, from Alberta and British Columbia south as far as California, Nevada, and Wyoming. Polygonum austiniae is an branching herb up to 20 cm (7. 9 in) tall.

Polygonum bidwelliae is an uncommon species of flowering plant in the knotweed family known by the common name Bidwell's knotweed. The plant was named for American suffragist Annie Bidwell, who at one time lived in the Bidwell Mansion in Chico, California. She is the person who collected the type specimen in Northern California. Polygonum bidwelliae is endemic to California, where it is known from the northern Sacramento Valley and adjacent slopes of the southernmost Cascade Range in Butte, Shasta, and Tehama Counties. It grows in chaparral, woodland, and grassland habitat on volcanic soils. Polygonum bidwelliae is an annual herb producing an erect green, wiry, angled stem reaching 20 centimeters (8 inches) in height. The narrow, pointed leaves are oppositely arranged along the stem, mainly on the upper parts of stem branches. The leaves have relatively large stipules which form ochrea that sheath the stem, sometimes hiding the leaf bases. The sharp-pointed stipules are membranous and silvery white. Bright pink flowers occur in upper leaf axils.

Polygonum bolanderi is an uncommon California species of flowering plant in the buckwheat family known by the common name Bolander's knotweed. Polygonum bolanderi is endemic to northern California, where it is known from the northern Coast Ranges, the southern Cascades, and the northern Sierra Nevada (from Humboldt County and Shasta, south as far as Sonoma county and Tuolumne County). It can be found in open, rocky habitats. Polygonum bolanderi is a small shrub producing numerous very thin twiglike branches up to about half a meter (20 inches) long from a tough, tangled base. The slender branches are lined with small, narrow, pointed leaves which are alternately arranged and mostly found clustered toward the tips of the twigs. The leaves have narrow, fringed stipules with sharp points. Flowers occur in upper leaf axils during summer and fall. They are whitish or pink with dark midveins on each corolla lobe.

Polygonum californicum is a species of flowering plant in the buckwheat family known by the common name California knotweed. It is native to the west coast of the United States from Washington, Oregon, and northern and central California in the Coast Ranges and Sierra Nevada foothills as far south as Napa and Tulare Counties. It can be found in many types of open habitats. Polygonum californicum is an annual herb producing a slender, angled stem which grows erect to a maximum height near 40 centimeters. The narrow, pointed leaves are mostly located on upper branches of the stem. The leaves have fringed, bristle-tipped stipules attached to their bases. Solitary white or pink flowers occur in upper leaf axils. Polygonum californicum is an annual herb producing a slender, angled stem which grows erect to a maximum height near 40 centimeters. The narrow, pointed leaves are mostly located on upper branches of the stem. The leaves have fringed, bristle-tipped stipules attached to their bases. Solitary white or pink flowers occur in upper leaf axils.

Polygonum douglasii is a species of flowering plant in the knotweed family known by the common name Douglas's knotweed. It is native to much of northern and western North America, where it can be found in many types of habitat, including disturbed areas. It has been found in Canada from British Columbia north to Yukon and east as far as Québec, and in the United States as far south as California, New Mexico, Iowa, and New York. Polygonum douglasii is known as a species complex, as there are many subspecies that may be better treated as species in their own right.

Polygonum hickmanii is a rare species of flowering plant in the buckwheat family known by the common names Scotts Valley polygonum and Hickman's knotweed. It is endemic to Santa Cruz County, California, where it is known from only two sites in the Scotts Valley. It grows on coastal prairie on mudstone and sandstone substrates, in an area known for its spring wildflowers. The small plant was first noted in 1990 and described as a new species in 1995. The plant is a federally listed endangered species. Polygonum hickmanii is a small annual plant forming compact patches on the ground, its stem growing no more than about 5 centimeters (2 inches) tall. It is lined with linear leaves especially near the tips of the branches, and has a cylindrical, shreddy ochrea. Solitary flowers occur in the leaf axils. They are only 2 or 3 millimeters long and white or pink-tinged in color. The eight tiny stamens are tipped with orange-pink anthers.