Mesa Dropseed
Sporobolus flexuosus
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Marsh Hedgenettle
Stachys palustris
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Panamint Princesplume
Stanleya elata
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Prince's Plume
Stanleya pinnata
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Stemless Mock Goldenweed
Stenotus acaulis
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Woolly Mock Goldenweed
Stenotus lanuginosus
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Tufted Wirelettuce
Stephanomeria paniculata
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Parry's Rock Pink
Stephanomeria parryi
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Parish's Wire Lettuce
Stephanomeria pauciflora
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Narrow-leaved Wire-lettuce
Stephanomeria tenuifolia
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Queen's-root
Stillingia linearifolia
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Mojave Toothleaf
Stillingia paucidentata
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Annual Toothleaf
Stillingia spinulosa
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Indian Ricegrass
Stipa hymenoides
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Columbia Needlegrass
Stipa nelsonii
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Dore's Needlegrass
Stipa nelsonii var. dorei
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California Needle Grass
Stipa occidentalis var. californica
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Desert Stipa
Stipa speciosa
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Webber's Needle Grass
Stipa webberi
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Longbeak Streptanthella
Streptanthella longirostris
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Nevada Pondweed
Stuckenia striata
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Leafcover Saltweed
Stutzia covillei
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Desert Neststraw
Stylocline micropoides
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Horned Seablite
Suaeda calceoliformis
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Bush Seepweed
Suaeda nigra
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Eaton's Aster
Symphyotrichum bracteolatum
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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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Fremont's-gold
Syntrichopappus fremontii
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Cotton Catclaw
Tetradymia axillaris
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Longspine Horsebrush
Tetradymia axillaris var. axillaris
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Spineless Horsebrush
Tetradymia canescens
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Littleleaf Horsebrush
Tetradymia glabrata
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Mojave Cottonthorn
Tetradymia stenolepis
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Hill Sun Cup
Tetrapteron graciliflorum
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Palmer Evening Primrose
Tetrapteron palmeri
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Small Coastal Germander
Teucrium cubense
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Turpentinebroom
Thamnosma montana
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Crisped Thelypody
Thelypodium crispum
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Nodding Thelypody
Thelypodium flexuosum
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Howell's Thelypody
Thelypodium howellii
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Cutleaf Thelypody
Thelypodium laciniatum
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Fiveneedle Pricklyleaf
Thymophylla pentachaeta
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Thymophylla pentachaeta var. belenidium
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Hairy Lacepod
Thysanocarpus curvipes
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Thysanocarpus curvipes ssp. amplectens
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Narrowleaf Fringe Pod
Thysanocarpus laciniatus
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Woody Crinklemat
Tiquilia canescens
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Annual Tiquilia
Tiquilia nuttallii
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Palmer's Tiquilia
Tiquilia palmeri
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Fan-leaved Tiquilia
Tiquilia plicata
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Tufted Townsend Daisy
Townsendia scapigera
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Desert Deathcamas
Toxicoscordion brevibracteatum
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Panicled Death Camas
Toxicoscordion paniculatum
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Three Hearts
Tricardia watsonii
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Yellowdome
Trichoptilium incisum
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Parish's Bluecurls
Trichostema parishii
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Slim Tridens
Tridens muticus
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Fiveleaf Clover
Trifolium andersonii
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Hollyleaf Clover
Trifolium gymnocarpon