California Cord Grass
Sporobolus foliosus
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Alkali Cord Grass
Sporobolus hookerianus
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Ajuga Hedge Nettle
Stachys ajugoides
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White Hedge Nettle
Stachys albens
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Berg's Hedgenettle
Stachys bergii
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Coastal Hedgenettle
Stachys chamissonis
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Marsh Hedgenettle
Stachys palustris
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Short Spike Hedge Nettle
Stachys pycnantha
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Rigid Hedge Nettle
Stachys rigida var. rigida
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Sonoma Hedgenettle
Stachys stricta
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Sitka Starwort
Stellaria borealis ssp. sitchana
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Northern Starwort
Stellaria calycantha
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Crisp Starwort
Stellaria crispa
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Longstalk Starwort
Stellaria longipes
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Goldie's Starwort
Stellaria longipes ssp. longipes
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Umbellate Starwort
Stellaria umbellata
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Western Featherbells
Stenanthium occidentale
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Claspleaf Twistedstalk
Streptopus amplexifolius
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Streptopus amplexifolius var. americanus
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Screwbean Mesquite
Strombocarpa pubescens
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Deer Fern
Struthiopteris spicant
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Fineleaf Pondweed
Stuckenia filiformis
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Pondweed
Stuckenia pectinata
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Nevada Pondweed
Stuckenia striata
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Leafcover Saltweed
Stutzia covillei
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Horned Seablite
Suaeda calceoliformis
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Bush Seepweed
Suaeda nigra
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Seablite
Suaeda taxifolia
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Water Awlwort
Subularia aquatica
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Star Swertia
Swertia perennis
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Eaton's Aster
Symphyotrichum bracteolatum
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Dwarf Coast Aster
Symphyotrichum chilense 'Dwarf'
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Parry's Leafy Aster
Symphyotrichum foliaceum var. apricum
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Parry's Aster
Symphyotrichum foliaceum var. parryi
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Short-rayed Alkali Aster
Symphyotrichum frondosum
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Western Lance Leaf Aster
Symphyotrichum lanceolatum var. hesperium
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Western Mountain Aster
Symphyotrichum spathulatum var. spathulatum
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Western Bog Aster
Symphyotrichum spathulatum var. yosemitanum
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Diffuseflower Evening Primrose
Taraxia subacaulis
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Small Coastal Germander
Teucrium cubense
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Western Meadow Rue
Thalictrum occidentale
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Fewflower Meadow-rue
Thalictrum sparsiflorum
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Entireleaved Thelypody
Thelypodium integrifolium
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Entireleaved Thelypody
Thelypodium integrifolium ssp. affine
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Desert Cistanthe
Thingia ambigua
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Western Red Cedar
Thuja plicata
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Sugar Scoop
Tiarella trifoliata
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Piggyback Plant
Tolmiea menziesii
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Cool Gold Piggy Back Plant
Tolmiea menziesii 'Cool Gold'
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Taff's Gold Piggy Back Plant
Tolmiea menziesii 'Taff's Gold'
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Spiked False Mannagrass
Torreyochloa erecta
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Weak Manna Grass
Torreyochloa pallida var. pauciflora
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Chaparral Zygadene
Toxicoscordion fremontii
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Death Camas
Toxicoscordion venenosum
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Death Camas
Toxicoscordion venenosum var. venenosum
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Carolina Bugbane
Trautvetteria caroliniensis
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Western Tofieldia
Triantha occidentalis ssp. occidentalis
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Desert Horsepurslane
Trianthema portulacastrum
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Yosemite Bulrush
Trichophorum clementis
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San Jacinto Bluecurls
Trichostema austromontanum ssp. austromontanum