Complete list of species
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| scientific name | common name(s) | image gallery |
| Alnus rubra | Red Alder Western Alder | |
| Alnus serrulata | Smooth Alder Hazel Alder Brookside Alder Tag Alder Common Alder Black Alder | |
| Alnus viridis | Green Alder | |
| Alnus viridis ssp. crispa | Mountain Alder Green Alder Sitka Alder | |
| Alnus viridis ssp. fruticosa | Siberian Alder | |
| Alnus viridis ssp. sinuata | Sitka Alder Mountain Alder | |
| Alnus ×fallacina | Alder | |
| Alopecurus aequalis | Shortawn Foxtail | |
| Alopecurus aequalis var. aequalis | Shortawn Foxtail | |
| Alopecurus aequalis var. sonomensis | Sonoma Shortawn Foxtail | |
| Alopecurus carolinianus | Carolina Foxtail | |
| Alopecurus magellanicus | Alpine Foxtail Alpine Meadow Foxtail Alpine Meadow-foxtail Boreal Foxtail | |
| Alopecurus saccatus | Pacific Foxtail Pacific Meadow Foxtail | |
| Alopecurus ×haussknechtianus | Foxtail | |
| Alophia drummondii | Propeller Flower Purple Pleat-leaf Pinewoods Lily Prairie Iris Pleatleaf Iris | |
| Aloysia gratissima | Whitebrush Bee-brush White-brush Common Bee-brush Beebrush Privet Lippia | |
| Aloysia gratissima var. gratissima | Whitebrush Beebrush | |
| Aloysia gratissima var. schulziae | Whitebrush Beebrush | |
| Aloysia macrostachya | Rio Grande Beebrush Woolly Bee-brush | |
| Aloysia wrightii | Wright's Beebrush Wright's Lippia | |
| Alphitonia ponderosa | Hawaii Kauilatree Kauila Kauwila Oa | |
| Alsinidendron lychnoides | Kuawawaenohu | |
| Alsinidendron obovatum | Waianae Range Alsinidendron | |
| Alsinidendron trinerve | Mountain Alsinidendron | |
| Alsinidendron viscosum | Climbing Alsinidendron | |
| Alternanthera flavescens | Yellow Joyweed | |
| Alternanthera maritima | Seaside Joyweed | |
| Alternanthera paronychioides | Smooth Joyweed | |
| Alternanthera paronychioides var. paronychioides | Smooth Joyweed | |
| Alvaradoa amorphoides | Mexican Alvaradoa | |
| Alvaradoa amorphoides ssp. psilophyllis | Mexican Alvaradoa | |
| Alyssum obovatum | American Madwort | |
| Alyxia stellata | Maile | |
| Amaranthus acanthochiton | Greenstripe Greenstripe Pigweed | |
| Amaranthus arenicola | Sandhill Amaranth Sand Amaranth Sand Pigweed | |
| Amaranthus australis | Southern Amaranth Southern Pigweed Southern Water-hemp | |
| Amaranthus bigelovii | Bigelow's Amaranth | |
| Amaranthus brownii | Brown's Amaranth Brown's Pigweed | |
| Amaranthus californicus | California Amaranth California Pigweed | |
| Amaranthus cannabinus | Salt-marsh Water-hemp Tidal-marsh Water-hemp Tidalmarsh Amaranth Water-hemp Pigweed | |
| Amaranthus crassipes | Spreading Amaranth Clubfoot Amaranth Tropical Spreading Amaranth Spreading Pigweed | |
| Amaranthus crassipes var. warnockii | Clubfoot Amaranth Spreading Amaranth Spreading Pigweed | |
| Amaranthus fimbriatus | Fringed Amaranth Fringed Pigweed Blite | |
| Amaranthus floridanus | Florida Amaranth Florida Pigweed Florida Water-hemp | |
| Amaranthus greggii | Gregg's Amaranth | |
| Amaranthus hybridus | Slim Amaranth | |
| Amaranthus obcordatus | Trans-Pecos Amaranth Trans-Pecos Pigweed | |
| Amaranthus palmeri | Carelessweed | |
| Amaranthus polygonoides | Tropical Amaranth | |
| Amaranthus powellii | Powell's Amaranth Green Amaranth Powell's Smooth Amaranth | |
| Amaranthus powellii ssp. bouchonii | Green Amaranth Powell's Smooth Amaranth Powell's Amaranth Powell's Pigweed | |
| Amaranthus powellii ssp. powellii | Green Amaranth Powell's Smooth Amaranth Powell's Amaranth Powell's Pigweed | |
| Amaranthus pringlei | Pringle's Amaranth Pringle's Pigweed | |
| Amaranthus pumilus | Seaside Amaranth | |
| Amaranthus retroflexus | Redroot Amaranth | |
| Amaranthus scleropoides | Bonebract Amaranth | |
| Amaranthus spinosus | Spiny Amaranth Thorny Pigweed | |
| Amaranthus tamaulipensis | Tamaulipas Amaranth Tamaulipas Pigweed | |
| Amaranthus torreyi | Sandhill Amaranth Torrey's Amaranthus Torrey's Pigweed | |
| Amaranthus tuberculatus | Roughfruit Amaranth Water Hemp | |
| Amaranthus venulosus | Fringed Amaranth Fringed Pigweed | |
| Amaranthus viridis | Slender Amaranth | |
| Amaranthus watsonii | Careless Weed Watson's Amaranth Watson's Pigweed | |
| Amaranthus wrightii | Wright's Amaranth Wright's Pigweed | |
| Amaranthus ×texensis | Pigweed | |
| Amaranthus ×tucsonensis | Pigweed | |
| Amblyolepis setigera | Huisache Daisy Butterfly Daisy Honey Daisy | |
| Amblyopappus pusillus | Dwarf Coastweed Pineapple Weed | |
| Ambrosia acanthicarpa | Flatspine Bur Ragweed Annual Burweed Annual Bursage Hooker's Bur Ragweed Western Sand-bur | |
| Ambrosia ambrosioides | Ambrosia Leaf Bur Ragweed Canyon Ragweed Ambrosia Bursage Big Bursage | |
| Ambrosia artemisiifolia | Annual Ragweed Short Ragweed | |
| Ambrosia artemisiifolia var. artemisiifolia | Annual Ragweed | |
| Ambrosia artemisiifolia var. elatior | Annual Ragweed Common Ragweed | |
| Ambrosia artemisiifolia var. paniculata | Annual Ragweed Common Ragweed | |
| Ambrosia bidentata | Ragweed Lanceleaf Ragweed Southern Ragweed | |
| Ambrosia canescens | Hairy Ragweed | |
| Ambrosia chamissonis | Silver Bur Ragweed | |
| Ambrosia cheiranthifolia | Rio Grande Ragweed South Texas Ragweed | |
| Ambrosia chenopodiifolia | San Diego Bur Ragweed San Diego Bursage | |
| Ambrosia confertiflora | Weakleaf Bur Ragweed Weak Leaved Burweed Slimleaf Bursage | |
| Ambrosia cordifolia | Tucson Bur Ragweed Sonoran Bursage Heartleaf Bursage | |
| Ambrosia deltoidea | Triangle Bur Ragweed Bursage Bur Sage Triangle Bursage | |
| Ambrosia dumosa | Burrobush White Bursage White Bur Sage | |
| Ambrosia eriocentra | Woolly Fruit Bur Ragweed Woolly Bursage | |
| Ambrosia grayi | Woollyleaf Bur Ragweed | |
| Ambrosia hispida | Coastal Ragweed Beach Ragweed Bay Geranium | |
| Ambrosia ilicifolia | Hollyleaf Bur Ragweed Hollyleaf Bursage | |
| Ambrosia linearis | Streaked Bur Ragweed Colorado Bursage Linear-leaf Bursage Plains Ragweed | |
| Ambrosia psilostachya | Cuman Ragweed Western Ragweed Perennial Ragweed Common Ragweed | |
| Ambrosia pumila | Dwarf Bur Ragweed San Diego Ambrosia San Diego Ragweed | |
| Ambrosia tomentosa | Skeletonleaf Bur Ragweed Silverleaf Povertyweed Skeleton-leaf Bursage | |
| Ambrosia trifida | Great Ragweed Giant Ragweed | |
| Ambrosia trifida var. texana | Texan Great Ragweed Giant Ragweed | |
| Ambrosia trifida var. trifida | Great Ragweed | |
| Ambrosia ×helenae | Ragweed Helen Ragweed | |
| Ambrosia ×intergradiens | Ragweed | |
| Amelanchier alnifolia | Saskatoon Serviceberry Western Serviceberry Juneberry | |
| Amelanchier alnifolia var. alnifolia | Saskatoon Serviceberry | |
| Amelanchier alnifolia var. cusickii | Cusick's Shadbush Cusick's Serviceberry | |
| Amelanchier alnifolia var. humptulipensis | Many-flowered Shadbush Saskatoon Serviceberry | |
| scientific name | common name(s) | image gallery |
