Complete list of species
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| scientific name | common name(s) | image gallery |
| Abies amabilis | Pacific Silver Fir Cascade Fir Lovely Fir White Fir Red fir | |
| Abies balsamea | Balsam Fir Blister Pine Northern Balsam | |
| Abies balsamea var. balsamea | Balsam Fir | |
| Abies balsamea var. phanerolepis | Balsam Fir Canaan Fir | |
| Abies bracteata | Bristlecone Fir | |
| Abies concolor | White Fir Balsam Fir Colorado Fir Concolor Fir Silver Fir White Balsam Oyamel De California | |
| Abies fraseri | Fraser Fir She-balsam | |
| Abies grandis | Grand Fir Giant Fir | |
| Abies lasiocarpa | Subalpine Fir | |
| Abies lasiocarpa var. arizonica | Arizona Corkbark Fir Blue Cork Bark Fir Corkbark Fir | |
| Abies lasiocarpa var. lasiocarpa | Alpine Fir Subalpine Fir | |
| Abies lowiana | Sierra White Fir California White Fir White Fir | |
| Abies magnifica | California Red Fir Red Fir | |
| Abies magnifica var. magnifica | California Red Fir Shasta Red Fir Silvertip Fir | |
| Abies magnifica var. shastensis | Shasta Red Fir | |
| Abies procera | Noble Fir | |
| Abildgaardia ovata | Flat-spike Sedge Flatspike Sedge | |
| Abronia alpina | Alpine Sand-verbena Ramshaw Meadows Abronia Ramshaw Meadows Sand Verbena | |
| Abronia ameliae | Amelia's Sand-verbena Heart's Delight | |
| Abronia ammophila | Wyoming Sand Verbena Yellowstone Sand-verbena | |
| Abronia angustifolia | Purple Sand Verbena Narrow-leaf Sand-verbena | |
| Abronia argillosa | Clay Sand Verbena Clay Sand-verbena | |
| Abronia bigelovii | Galisteo Sand Verbena Galisteo Sand-verbena | |
| Abronia bolackii | Bolack's Sand Verbena Bolack's Sand-verbena | |
| Abronia carletonii | Carleton's Sand Verbena Carleton's Sand-verbena | |
| Abronia elliptica | Fragrant White Sand Verbena Snowball Sand Verbena | |
| Abronia fragrans | Fragrant Sand-verbena Snowball Sand Verbena Sweet Sand-verbena Prairie Snowball Sand Verbena Heart's Delight | |
| Abronia gracilis | Alfambrilla Graceful Sand Verbena Graceful Sand-verbena Slender Sand Verbena | |
| Abronia insularis | Island Sand Verbena Island Sand-verbena | |
| Abronia latifolia | Coastal Sand Verbena Yellow Sand Verbena | |
| Abronia macrocarpa | Large-fruit Sand-verbena Largefruit Sand Verbena | |
| Abronia maritima | Red Sand Verbena | |
| Abronia mellifera | White Sand Verbena | |
| Abronia minor | Little Sand Verbena Little Sand-verbena | |
| Abronia nana | Dwarf Sand Verbena Dwarf Sand-verbena | |
| Abronia nana var. covillei | Coville's Dwarf Sand Verbena Coville's Dwarf Sand-verbena | |
| Abronia nana var. harrisii | Harris' Dwarf Sand Verbena Harris' Dwarf Sand-verbena | |
| Abronia nana var. nana | Dwarf Sand Verbena Dwarf Sand-verbena | |
| Abronia neurophylla | Beach Sand Verbena Beach Sand-verbena | |
| Abronia pogonantha | Mojave Sand Verbena | |
| Abronia turbinata | Trans Montane Sand Verbena Transmontane Sand Verbena Transmontane Sand-verbena | |
| Abronia umbellata | Pink Sand Verbena Beach Sand Verbena | |
| Abronia umbellata ssp. breviflora | Pink Sand Verbena Pink Sand-verbena | |
| Abronia umbellata ssp. umbellata | Beach Sand Verbena Pink Sand Verbena Pink Sand-verbena | |
| Abronia villosa | Desert Sand Verbena Desert Sand-verbena Desert Sandverbena | |
| Abronia villosa var. aurita | Desert Sand Verbena Desert Sand-verbena Yellow Hairy Sand Verbena | |
| Abronia villosa var. villosa | Desert Sand Verbena Sand Verbena | |
| Abutilon abutiloides | Shrubby Indian Mallow | |
| Abutilon berlandieri | Berlandier's Indian Mallow Berlandier's Indian-mallow | |
| Abutilon eremitopetalum | Hidden-petaled Ilima Hiddenpetal Indian Mallow | |
| Abutilon fruticosum | Texas Indian Mallow Indian Mallow | |
| Abutilon hulseanum | Mauve | |
| Abutilon hypoleucum | Whiteleaf Indian Mallow White-leaf Indian-mallow Rio Grande Abutilon | |
| Abutilon incanum | Pelotazo Indian Mallow Shrubby Indian Mallow | |
| Abutilon malacum | Yellow Indian Mallow | |
| Abutilon menziesii | Ko'oloa 'Ula Kooloa Ula Red Ilima | |
| Abutilon mollicomum | Pintapán Cimarrón Sonoran Indian Mallow Sonoran Indian-mallow | |
| Abutilon palmeri | Palmer's Indian Mallow Santa Catalina Indian-mallow | |
| Abutilon parishii | Parish's Indian Mallow Pima Indian-mallow | |
| Abutilon parvulum | Dwarf Indian Mallow | |
| Abutilon permolle | Coastal Indian Mallow Coastal Indian-mallow Velvety Abutilon | |
| Abutilon reventum | Yellow-flower Indian-mallow Yellowflower Indian Mallow | |
| Abutilon sandwicense | Greenflower Indian Mallow Green-flower Indian-mallow Ko'olua Ma'oma'o | |
| Abutilon thurberi | Thurber's False Velvetleaf Thurber's Indian Mallow Thurber's Indian-mallow | |
| Abutilon trisulcatum | Anglestem Indian Mallow | |
| Abutilon wrightii | Wright's Indian Mallow | |
| Acacia koa | Koa | |
| Acacia koaia | Koaoha Dwarf Koa Koaie Koai'e Koaia | |
| Acaciella angustissima | Prairie Acacia Fern Acacia Whiteball Acacia Prairie Wattle White-ball Acacia | |
| Acaciella angustissima var. chisosiana | Chisos Prairie Acacia | |
| Acaciella angustissima var. hirta | Prairie Acacia Texas Prairie Acacia Texas Fern Acacia Prairie Wattle | |
| Acaciella leucothrix | Whitehair Acacia | |
| Acaciella shrevei | Shreve's Prairie Acacia | |
| Acaciella suffrutescens | Prairie Acacia | |
| Acaena exigua | Liliwai Nani Wai'ale'ale | |
| Acaena pinnatifida | Argentinian Biddy Biddy Argentinian Biddy-biddy | |
| Acaena pinnatifida var. californica | California Acaena California Biddy-biddy California Sheepburr | |
| Acalypha californica | California Copperleaf | |
| Acalypha chamaedryfolia | Bastard Copperleaf Everglades Copperleaf | |
| Acalypha deamii | Deam's Threeseed Mercury Largeseeded Mercury | |
| Acalypha gracilens | Slender Threeseed Mercury | |
| Acalypha monococca | Slender Threeseed Mercury | |
| Acalypha monostachya | Round Copperleaf | |
| Acalypha neomexicana | New Mexico Copperleaf Three-seeded Mercury | |
| Acalypha ostryifolia | Pineland Threeseed Mercury Hop-hornbeam Copperleaf | |
| Acalypha phleoides | Shrubby Copperleaf Three-seeded Mercury | |
| Acalypha poiretii | Poiret's Copperleaf | |
| Acalypha radians | Cardinal's Feather Cardinal Feather | |
| Acalypha rhomboidea | Common Threeseed Mercury Virginia Threeseed Mercury | |
| Acalypha virginica | Virginia Threeseed Mercury | |
| Acamptopappus shockleyi | Shockley's Goldenhead | |
| Acamptopappus sphaerocephalus | Rayless Goldenhead | |
| Acamptopappus sphaerocephalus var. hirtellus | Rayless Goldenhead | |
| Acamptopappus sphaerocephalus var. sphaerocephalus | Rayless Goldenhead | |
| Acanthocereus tetragonus | Triangle Cactus Barbed-wire Cactus Chaco | |
| Acanthomintha duttonii | San Mateo Thorn-mint San Mateo Thornmint San Mateo Thorn Mint | |
| Acanthomintha ilicifolia | San Diego Thorn-mint San Diego Thornmint San Diego Thorn Mint | |
| Acanthomintha lanceolata | Santa Clara Thorn-mint Santa Clara Thornmint Santa Clara Thorn Mint | |
| Acanthomintha obovata | San Benito Thorn-mint San Benito Thornmint San Benito Thorn Mint | |
| Acanthomintha obovata ssp. cordata | Heartleaf Thorn-mint Heartleaf Thorn Mint Heart-leaved Thornmint Heart Leaved Thorn Mint | |
| scientific name | common name(s) | image gallery |
