Complete list of species
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| scientific name | common name(s) | image gallery |
| 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 | Beebrush Whitebrush | |
| 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 | Blite Fringed Amaranth Fringed Pigweed | |
| 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 Amaranth Powell's Pigweed Powell’s Smooth Amaranth | |
| Amaranthus powellii ssp. powellii | Green Amaranth Powell's Amaranth Powell's Pigweed Powell’s Smooth Amaranth | |
| 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 | |
| scientific name | common name(s) | image gallery |
