Tackstem,
White (Calycoseris
wrightii)
Yellow (Calycoseris
parryi)
Tahquitz ivesia (Ivesia callida)
Tall fescue (Festuca arundinacea)*
Tall flat sedge (Cyperus eragrostis)
Tall hawksbeard (Crepis acuminata)
Tall horseweed (Erigeron
canadensis)
Tall melica (Melica frutescens)
Tall wheat grass (Elymus ponticus)*
Tanbark oak (Notholithocarpus densiflorus var. densiflorus)
Tansy mustard,
[Common] (Descurainia
pinnata)
Mountain (Descurainia
incana)
Mountain (Descurainiia incisa)
Sierra (Descurainia
californica)
Tansy phacelia (Phacelia
tanacetifolia)
Tarragon, Wild (Artemisia dracunculus)
Tarplant,
Graceful (Holocarpha
virgata ssp. elongata)
Heermann's (Holocarpha
heermannii)
Island (Deinandra clementina)
Mojave (Deinandra mohavensis)
Otay (Deinandra conjugens)
Red Rock (Deinandra
arida)
San Diego (Deinandra
paniculata)
Santa Susana (Deinandra
minthornii)
Slender (Deinandra
fasciculata)
Southern (Centromadia parryi ssp. australis)
Tauschia,
Parish's (Tauschia
parishii)
Southern (Tauschia
arguta)
Tawny popcorn flower (Plagiobothrys
fulvus)
Tecate cypress (Hesperocyparis forbesii)
Tehachapi ragwort (Packera ionophylla)
Tejon cryptantha (Cryptantha microstachys)
Telegraph weed (Heterotheca
grandiflora)
Terracina spurge (Euphorbia terracina)*
Tetracoccus, Parry's (Tetracoccus dioicus)
Thickleaf yerba santa (Eriodictyon
crassifolium)
Thick-leaved ground-cherry (Physalis
crassifolia)
Thick-leaved phacelia (Phacelia
pachyphylla)
Thickstem wild cabbage (Caulanthus
crassicaulis)
Thimbleberry (Rubus
parviflorus)
Thistle,
Barbwire Russian (Salsola
paulsenii)*
Blessed (Centaurea
benedictus)*
Bull (Cirsium vulgare)*
California (Cirsium
occidentale var. californicum)
Cobweb (Cirsium
occidentale var. occidentale)
Desert (Cirsium neomexicanum)
Elk (Cirsium scariosum)
Italian (Carduus
pycnocephalus ssp. pycnocephalus)*
Milk (Silybum marianum)*
Mojave (Cirsium mohavense)
Red (Cirsium arizonicum var. tenuisectum)
Russian (Salsola
tragus)*
Venus (Cirsium occidentale
var. venustum)
Yellow star (Centaurea
solstitialis)*
Thistle sage (Salvia
carduacea)
Thomas' buckwheat (Eriogonum thomasii)
Thornbush,
Anderson (Lycium
andersonii)
Fremont's (Lycium
fremontii)
Thorne's buckwheat (Eriogonum thornei)
Thornmint,
Heartleaf (Acanthomintha obovata ssp. cordata)
San Diego (Acanthomintha
ilicifolia)
Thorny skeleton-plant (Pleiacanthus
spinosus)
Thoroughwort (Ageratina adenophora)*
Threadleaf rubber rabbitbrush (Ericameria
nauseosa ssp. oreophila)
Thread-leaved brodiaea (Brodiaea
filifolia)
Threadplant,
Comb-leaved (Nemacladus pinnatifidus)
Desert (Nemacladus
rubescens)
Eastern (Nemacladus
orientalis)
Glandular (Nemacladus glanduliferus)
Long-flowered (Nemacladus longiflorus var. breviflorus)
Long-flowered (Nemacladus longiflorus var. longiflorus)
Sigmoid (Nemacladus sigmoideus)
Slender (Nemacladus tenuis var. tenuis)
Smallflower (Nemacladus ramosissimus)
Threadstem (Pterostegia drymarioides)
Threadstem carpet-weed (Mollugo cerviana)*
Threadstem gilia (Linanthus filiformis)
Threadstem madia (Madia exigua)
Three-awn (Aristida adscensionis)
Three-hearts (Tricardia watsonii)
Threelobe oxytheca (Sidotheca trilobata)
Three-petal bedstraw (Galium trifidum ssp. columbianum)
Three-petal bedstraw (Galium trifidum ssp. subbiflorum)
Three-spot (Osmadenia
tenella)
Thurber penstemon (Penstemon thurberi)
Thurber's spineflower (Centrostegia thurberi)
Thurber's stemsucker (Pilostyles thurberi)
Thyme-leaved speedwell (Veronica
serpyllifolia ssp. humifusa)*
Thyme-leaved spurge (Chamaesyce serpyllifolia
ssp. serpyllifolia)
Thymophylla, Five-needled (Thymophylla
pentachaeta var. belenidium)
Tickseed, California (Leptosyne californica)
Tidestrom's milkvetch (Astragalus tidestromii)
Tidy tips,
White (Layia glandulosa)
Yellow (Layia
platyglossa)
Tiehm's rush (Juncus tiehmii)
Tiling's monkeyflower (Mimulus tilingii)
Timberline phacelia (Phacelia hastata
ssp. hastata)
Tinker's penny (Hypericum anagalloides)
Tiny bedstraw (Galium murale)*
Toad lily (Montia chamissoi)
Toad rush,
Common (Juncus
bufonius var. bufonius)
Clustered (Juncus
bufonius var. congestus)
Western (Juncus
bufonius var. occidentalis)
Toadflax, Blue (Nuttallanthus texanus)
Tobacco,
Coyote (Nicotiana
attenuata)
Desert (Nicotiana
obtusifolia)
Indian (Nicotiana
quadrivalvis)
Tree (Nicotiana glauca)
Tocalote (Centaurea melitensis)*
Tomcat clover (Trifolium
willdenovii)
Toothed calicoflower (Downingia cuspidata)
Torrey pine (Pinus torreyana)
Torrey's amaranth (Amaranthus torreyi)
Torrey's scrub oak (Quercus acutidens)
Tower mustard (Turritis glabra)
Toyon (Heteromeles arbutifolia)
Toyon berries (Heteromeles
arbutifolia)
Trailing windmills (Allionia incarnata var. incarnata)
Trailing windmills (Allionia incarnata var. villosa)
Transmontane gilia (Gilia transmontana)
Transverse fine-flower gilia (Gilia
leptantha ssp. transversa)
Trask's yerba santa (Eriodictyon traskiae)
Tree clover (Trifolium ciliolatum)
Tree of heaven (Ailanthus altissima)*
Tree poppy, Channel Island (Dendromecon
harfordii)
Tree tobacco (Nicotiana glauca)*
Trefoil, Pitch (Bituminaria bituminosa)*
Triangular-fruit sedge (Carex triquetra)
Tridens, Slim (Tridens muticus)
Triple-ribbed milkvetch (Astragalus tricarinatus)
Triteleia, Coast range (Triteleia
lugens)
Trixis, California (Trixis
californica var. californica)
Tubercled crowfoot (Ranunculus testiculatus)*
Tufted evening primrose (Oenothera
caespitosa ssp. marginata)
Tufted poppy (Eschscholzia
caespitosa)
Tumble mustard (Sisymbrium altissimum)*
Turion duckweed (Lemna turionifera)
Turkey pea (Sanicula tuberosa)
Turkish rugging (Chorizanthe
staticoides)
Turpentine bush (Ericameria laricifolia)
Turpentine-broom (Thamnosma montana)
Turtleback (Psathyrotes
ramosissima)
Twayblade (Listera convallarioides)
Twiggy wreathplant (Stephanomeria virgata
ssp. virgata)
Twinberry (Lonicera involucrata)
Twining snapdragon (Antirrhinum
kelloggii)
Twinleaf bedstraw (Galium bifolium)
Two-seeded milkvetch (Astragalus didymocarpus var. didymocarpus)
Two-tone everlasting (Pseudognaphalium
biolettii)
Umbrella plant (Cyperus involucratus)*
Urn-flowered alumroot (Heuchera caespitosa)
Utah agave (Agave utahensis)
Utah juniper (Juniperus osteosperma)
Utah penstemon (Penstemon utahensis)
Utah serviceberry (Amelanchier
utahensis)
Valerian, Red (Centranthus ruber)*
Valley broom-rape (Orobanche vallicola)
Valley or cane cholla (Cylindropuntia californica var.
parkeri)
Valley lupine (Lupinus
microcarpus var. microcarpus)
Valley popcorn flower (Plagiobothrys
canescens)
Varicolored buckwheat (Eriogonum
umbellatum var. versicolor)
Varied milkvetch (Astragalus lentiginosus
var. variabilis)
Variegated dudleya (Dudleya variegata)
Vasey's prickly-pear (Opuntia vaseyi)
Vasey's sage (Salvia vaseyi)
Veatch's blazing star (Mentzelia veatchiana)
Velvet ash (Fraxinus velutina)
Velvety false-lupine (Thermopsis macrophylla
var. semota)
Venus looking-glass (Triodanis biflora)
Venus thistle (Cirsium occidentale var. venustum)
Vera dulce (Aloysia wrightii)
Verbena,
Big-bract (Verbena
bracteata)
Goodding's (Verbena
gooddingii)
Vervain,
Mint-leaved (Verbena
menthifolia)
Robust (Verbena
lasiostachys var. scabrida)
Western (Verbena
lasiostachys var. lasiostachys)
Vetch,
American (Vicia
americana var. americana)
Slender (Vicia hassei)
Slim (Vicia ludoviciana
var. ludoviciana)
Spring (Vicia sativa)*
Winter (Vicia villosa)*
Viguiera, Parish's (Viguiera parishii)
Vinegar weed (Trichostema
lanceolatum)
Violet,
Blue (Viola adunca ssp. adunca)
Douglas's (Viola
douglasii)
Gray-leaved (Violet pinetorum ssp. grisea)
Macloskey's (Viola
macloskeyi)
Oak (Viola
purpurea ssp. quercetorum)
Pine (Viola pinetorum ssp. pinetorum)
Shelton's (Viola sheltonii)
Yellow
(Viola lobata
ssp. lobata)
Violet false-gilia (Allophyllum gilioides
ssp. violaceum)
Violet snapdragon (Antirrhinum
nuttallianum ssp. nuttallianum)
Violet twining snapdragon (Maurandella
antirrhiniflora)
Virgin River cryptantha (Cryptantha
virginensis)
Virginia pickleweed (Salicornia virginica)
Virgin's bower (Clematis ligusticifolia)
Viscid lipfern (Cheilanthes viscida)
Volcanic gilia (Gilia ochroleuca ssp. bizonata)
Volcanic gilia (Gilia ochroleuca ssp. vivida)
Walker's sun cup (Chylismia walkeri ssp. tortilis)
Wall bedstraw (Galium parisiense)*
Wallflower,
Island (Erysimum
insulare)
Western (Erysimum
capitatum var. capitatum)
Walnut,
California black (female flowers) (Juglans
californica var. californica)
California black (fruit) (Juglans
californica var. californica)
California black (male flowers) (Juglans
californica var. californica)
Wand mullein (Verbascum virgatum)*
Wand wirelettuce (Stephanomeria virgata
ssp. pleurocarpa)
Warner Springs lessingia (Lessingia
glandulifera var. tomentosa)
Wart cress (Lepidium didymum)*
Wartleaf ceanothus (Ceanothus papillosus)
Wartstem ceanothus (Ceanothus verrucosus)
Warty spurge (Euphorbia spathulata)
Water buttercup (Ranunculus aquatilis var.
capillaceus)
Water parsnip (Berula erecta)
Water plantain (Alisma triviale)
Water pygmy weed (Crassula aquatica)
Water smartweed (Polygonum punctatum)
Water speedwell (Veronica anagallis-aquatica)*
Watercress (Rorippa officinale)*
Water-parsley (Oenanthe sarmentosa)
Water-pimpernel (Samolus parviflorus)
Water-plantain buttercup, Small (Ranunculus
alismifolius var. alismellus)
Water-starwort (Callitriche heterophylla
var. bolanderi)
Wattle,
Cootamundra (Acacia
baileyana)*
Golden (Acacia longifolia)*
Watson's saltbush (Atriplex watsonii)
Watson's spike-moss (Selaginella watsonii)
Wavyleaf bee blossom (Oenothera sinuosa)*
Wax currant (Ribes cereum var. cereum)
Wax-myrtle, California (Morella californica)
Waxy saltbush (Atriplex glauca)*
Weak bluegrass (Poa infirma)*
Wedgeleaf horkelia (Horkelia cuneata)
Weed's intermediate mariposa lily (Calochortus weedii var. intermedius)
Weed's mariposa lily (Calochortus weedii
var. weedii)
Weedy cudweed (Pseudognaphalium luteoalbum)*
Western azalea (Rhododendron occidentale)
Western bistort (Bistorta bistortoides)
Western blue flag (Iris missouriensis)
Western blue flax (Linum lewisii var.
lewisii)
Western bog yellow-cress (Rorippa
palustris var. occidentalis)
Western buttercup (Ranunculus occidentalis)
Western chokecherry (Prunus virginiana
var. demissa)
Western cowbane (Oxypolis occidentalis)
Western dichondra (Dichondra occidentalis)
Western dwarf mistletoe (Arceuthobium campylopodum)
Western false-indigo (Amorpha fruticosa)
Western field dodder (Cuscuta campestris)
Western gilia (Gilia aliquanta ssp. breviloba)
Western goldenrod (Euthamia occidentalis)
Western hackberry (Celtis reticulata)
Western hawksbeard (Crepis occidentalis)
Western juniper (Juniperus grandis)
Western lady's mantle (Aphanes occidentalis)
Western lanceleaf aster (Symphyotrichum lanceolatum
ssp. hesperium)
Western morning glory (Calystegia
occidentalis ssp. fulcrata)
Western mountain aster (Symphyotrichum spathulatum var. spathulatum)
Western needlegrass (Stipa occidentalis ssp. occidentalis)
Western pearlwort (Sagina decumbens ssp. occidentalis)
Western poison oak (Toxicodendron
diversilobum)
Western polypody (Polypodium hesperium)
Western prickly-pear (Opuntia occidentalis)
Western ragweed (Ambrosia psilostachya)
Western raspberry (Rubus leucodermis)
Western redbud (Cercis
occidentalis)
Western sky pilot (Polemonium occidentale ssp. occidentale)
Western sword fern (Polystichum munitum)
Western sycamore (Platanus racemosa)
Western toad rush (Juncus bufonius var.
occidentalis)
Western vervain (Verbena
lasiostachys var. lasiostachys)
Western wallflower (Erysimum
capitatum var. capitatum)
Weston's buckwheat (Eriogonum nudum var.
westonii)
Wheat grass,
Desert crested (Agropyron
cristatum ssp. pectinatum)*
Intermediate (Elymus hispidus)*
Slender (Elymus trachycaulus ssp. trachycaulus)
Tall (Elymus ponticus)*
Wheeler's cinquefoil (Potentilla wheeleri)
Wheelscale saltbush (Atriplex elegans var. fasciculata)
Whiskerbrush (Leptosiphon ciliatus)
Whispering bells (Emmenanthe
penduliflora var. penduliflora)
White alder (Alnus rhombifolia)
White catchfly (Silene verecunda)
White clover (Trifolium repens)*
White easter bonnets (Eriophyllum lanosum)
White false-gilia (Allophyllum integrifolium)
White fiesta flower (Pholistoma membranaceum)
White fir (Abies concolor)
White hedge nettle (Stachys albens)
White mallow (Eremalche exilis)
White nightshade (Solanum
douglasii)
White pincushion (Chaenactis
artemisiifolia)
White rhatany (Krameria
grayi)
White sage (Salvia apiana)
White sand verbena (Abronia turbinata)
White snapdragon (Antirrhinum
coulterianum)
White snowberry (Symphoricarpos albus var. laevigatus)
White sweetclover (Melilotus albus)*
White tackstem (Calycoseris wrightii)
White tidy tips (Layia glandulosa)
White-flowered bluecup (Githopsis
diffusa ssp. candida)
White-flowered bog orchid (Platanthera
dilatata var. leucostachys)
White-flowered filaree (California macrophylla)
White-flowered hawkweed (Hieracium
albiflorum)
White-flowered rabbitbrush (Ericameria albida)
White-flowered rock-rose (Cistus
ladanifer var. albiflorus)*
White-flowering currant (Ribes
indecorum)
White-leaf monardella (Monardella
hypoleuca ssp. hypoleuca)
Whitemargin oxytheca (Sidotheca emarginata)
Whiteplume wirelettuce (Stephanomeria exigua
ssp. coronaria)
Whitestem blazing star (Mentzelia
albicaulis)
Whitestem filaree (Erodium moschatum)*
White-stemmed milkweed (Asclepias
albicans)
Whitethorn,
Chaparral (Ceanothus
leucodermis)
Mountain (Ceanothus
cordulatus)
Whitetip clover (Trifolium variegatum)
White-veined wintergreen (Pyrola
picta)
White-whorled lupine (Lupinus microcarpus var. densiflorus)
Whitney's locoweed (Astragalus whitneyi
var. whitneyi)
Whorled dock (Rumex conglomeratus)*
Whorl-leaf penstemon (Keckiella ternata
var. ternata)
Wide-leaved Parish's yampah (Perideridia
parishii ssp. latifolia)
Wide-leaved rock goldenbush (Ericameria
cuneata var. spathulata)
Wiggins's croton (Croton wigginsii)
Wilcox's woolstar (Eriastrum wilcoxii)
Wild cabbage,
Slender (Caulanthus
major)
Thickstem (Caulanthus
crassicaulis)
Wild carrot, American (Daucus
pusillus)
Wild celery (Apiastrum angustifolium)
Wild cucumber,
[Common] (Marah
macrocarpus var. macrocarpus)
Island (Marah
macrocarpus var. major)
Wild grape (Vitis girdiana)
Wild grape fruit (Vitis girdiana)
Wild heliotrope (Heliotropium
curassavicum)
Wild licorice (Glycyrrhiza
lepidota)
Wild oxalis (Oxalis californica)
Wild peony (Paeonia californica)
Wild peppergrass (Lepidium virginicum
ssp. menziesii)
Wild petunia (Petunia parviflora)
Wild radish (Raphanus sativus)*
Wild rhubarb (Rumex hymenosepalus)
Wild rose (Rosa californica)
Wild strawberry (Fragaria
vesca)
Wild tarragon (Artemisia dracunculus)
Wildrose Canyon buckwheat (Eriogonum
eremicola)
Wildrye,
Blue (Elymus glaucus
ssp. glaucus)
Creeping (Leymus
triticoides)*
Giant (Leymus condensatus)
Great Basin (Leymus
cinereus)
Pacific (Leymus
pacificus)
Willow,
Arroyo (Salix lasiolepis)
Desert (Chilopsis
linearis ssp. arcuata)
Goodding's black (Salix
gooddingii)
Lemmon's (Salix
lemmonii)
Red (Salix laevigata)
Sandbar (Salix exigua)
Scouler's (Salix
scouleriana)
Shining (Salix lucida
ssp. lasiandra)
Willow baccharis (Baccharis salicina)
Willow smartweed (Polygonum lapathifolium)
Willow-herb,
[Common] (Epilobium
ciliatum ssp. ciliatum)
Field (Epilobium
brachycarpum)
Glandular (Epilobium
ciliatum ssp. glandulosum)
Hall's (Epilobium hallianum)
Milkflower (Epilobium lactiflorum)
Oregon (Epilobium oregonense)
Smooth (Epilobium
glaberrimum ssp. glaberrimum)
Willowleaf lettuce (Lactuca saligna)*
Willow-leaved dock (Rumex salicifolius
var. denticulatus)
Willowy monardella (Monardella viminea)
Wind poppy (Stylomecon
heterophylla)
Winding mariposa lily (Calochortus flexuosus)
Windmill pink (Silene gallica)*
Winged pectocarya (Pectocarya penicillata)
Wingfruit sun cup (Chylismiella pterosperma)
Wingnut cryptantha (Cryptantha pterocarya)
Winter cress (Barbarea
orthoceras)
Winter vetch (Vicia villosa)*
Winterfat (Krascheninnikovia
lanata)
Wintergreen,
Bog (Pyrola asarifolia
ssp. asarifolia)
White-veined (Pyrola
picta)
Wire rush (Juncus balticus)
Wirelettuce,
Deane's (Stephanomeria
exigua ssp. deanei)
Small wirelettuce (Stephanomeria exigua ssp. exigua)
Wand (Stephanomeria
virgata ssp. pleurocarpa)
Whiteplume (Stephanomeria
exigua ssp. coronaria)
Wireweed (Rigiopappus leptocladus)
Wishbone bush (Mirabilis
laevis var. crassifolia)
Wolf's cholla (Cylindropuntia wolfii)
Wood rose (Rosa gymnocarpa)
Wood rush, Hairy (Luzula comosa)
Wood sorrel,
Creeping (Oxalis corniculata)*
Hairy (Oxalis pilosa)
Woodland spurge (Euphorbia lurida)
Woodland star,
Bolander's (Lithophragma bolanderi)
[Common] (Lithophragma
affine)
Hillside (Lithophragma heterophyllum)
Slender (Lithophragma
tenellum)
Woody crinklemat (Tiquilia canescens var. canescens)
Woolly amsonia (Amsonia tomentosa)
Woolly angelica (Angelica tomentosa)
Woolly bluecurls (Trichostema
lanatum)
Woolly brickellbush (Brickellia incana)
Woolly bur-sage (Ambrosia eriocentra)
Woolly chaparral pea (Pickeringia montana
var. tomentosa)
Woolly daisy (Eriophyllum
wallacei)
Woolly indian paintbrush (Castilleja
foliolosa)
Woolly lomatium (Lomatium dasycarpum ssp.
dasycarpum)
Woolly marigold (Baileya pleniradiata)
Woolly milkweed (Asclepias vestita)
Woolly mountain parsley (Oreonana
vestita)
Woolly mullein (Verbascum thapsus)*
Woolly plantain (Plantago ovata)
Woolly sea-blite (Suaeda taxifolia)
Woolly sunflower (Eriophyllum lanatum
var. obovatum)
Woolly sunflower, Nevin's (Constancea
nevinii)
Woollyhead neststraw (Stylocline micropoides)
Woollyheads,
Dwarf (Psilocarphus
brevissimus var. brevissimus)
Slender (Psilocarphus
tenellus var. tenellus)
Woollyleaf ceanothus (Ceanothus tomentosus)
Woollyleaf manzanita (Arctostaphylos
tomentosa)
Woollypod, Bear Valley (Astragalus
leucolobus)
Woolstar,
Desert (Eriastrum
eremicum ssp. eremicum)
Few-flowered (Eriastrum
sparsiflorum)
Giant (Eriastrum densifolium ssp. elongatum)
Harwood's (Eriastrum harwoodii)
Miniature (Eriastrum
diffusum)
Mojave (Eriastrum
densifolium ssp. mohavense)
Santa Ana River (Eriastrum
densifolium ssp. sanctorum)
Sapphire (Eriastrum
sapphirinum)
Southern mountain (Eriastrum
densifolium ssp. austromontanum)
Wilcox's (Eriastrum
wilcoxii)
Wreathplant,
San Diego (Stephanomeria
diegensis)
Twiggy (Stephanomeria
virgata ssp. virgata)
Wright's buckwheat
(Eriogonum wrightii
var. membranaceum)
(Eriogonum wrightii
var. subscaposum)
(Eriogonum wrightii
var. wrightii)
Wright's collinsia (Collinsia torreyi
var. wrightii)
Wright's thimblehead (Hymenothrix wrightii)
Wrinkled rush (Juncus rugulosus)
Wright's spiderling (Boerhavia wrightii)
Wrinkled spineflower (Chorizanthe corrugata)
Xantus pincushion (Chaenactis xantiana)
Xantus' spineflower (Chorizanthe xanti var. xanti)
Yampah,
Parish's (Perideridia parishii ssp. parishii)
Wide-leaved Parish's (Perideridia
parishii ssp. latifolia)
Yarrow,
[Common] (Achillea
millefolium)
Golden (Eriophyllum
confertiflorum var. confertiflorum)
Yellow bird-of-paradise (Caesalpinia
gilliesii)*
Yellow carpet (Blennosperma nanum var. nanum)
Yellow comet (Mentzelia affinis)
Yellow cryptantha (Cryptantha confertiflora)
Yellow cups (Chylismia
brevipes ssp. brevipes)
Yellow mariposa lily (Calochortus
clavatus var. pallidus)
Yellow monkeyflower (Mimulus
brevipes)
Yellow paintbrush (Castilleja plagiotoma)
Yellow penstemon (Keckiella antirrhinoides
var. antirrhinoides)
Yellow peppergrass (Lepidium flavum
var. flavum)
Yellow pincushion (Chaenactis
glabriuscula var. glabriuscula)
Yellow pine (Pinus ponderosa)
Yellow salsify (Tragopogon dubius)*
Yellow saucers (Malacothrix sonchoides)
Yellow star thistle (Centaurea solstitialis)*
Yellow sweetclover (Melilotus officinalis)*
Yellow tackstem (Calycoseris
parryi)
Yellow tidy tips (Layia
platyglossa)
Yellow turban (Eriogonum pusillum)
Yellow violet (Viola lobata ssp. lobata)
Yellow water-weed (Ludwigia peploides)
Yellow-cress, Western bog (Rorippa
palustris var. occidentalis)
Yellow-eyed grass (Sisyrinchium elmeri)
Yellow-eyed lupine (Lupinus flavoculatus)
Yellow-frocks (Eriophyllum
ambiguum var. paleaceum)
Yellowheads (Trichoptilium incisum)
Yellow-stemmed bush mallow (Malacothamnus
densiflorus)
Yellow-throated phacelia (Phacelia
brachyloba)
Yerba amarilla (Mentzelia multiflora var.
longiloba)
Yerba buena (Clinopodium douglasii)
Yerba mansa (Anemopsis californica)
Yerba santa,
Hairy (Eriodictyon
trichocalyx var. lanatum)
Smoothleaf (Eriodictyon
trichocalyx var. trichocalyx)
Thickleaf (Eriodictyon
crassifolium)
Trask's (Eriodictyon
traskiae)
Yosemite rock-cress (Boechera repanda)
Yucca,
Banana (Yucca baccata)
Chaparral (Hesperoyucca
whipplei)
Mojave (Yucca
schidigera)
Yuma spurge (Chamaesyce setiloba)
Zaca Lake manzanita (Arctostaphylos
glandulosa ssp. zacaensis)
Ziegler's aster (Dieteria canescens
var. ziegleri)
Zig-zag groundsmoke (Gayophytum heterozygum)
Zygadene, Desert (Zigadenus brevibracteatus)
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