Complete list of species
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| scientific name | common name(s) | image gallery |
| 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 Serviceberry Cusick’s Shadbush | |
| Amelanchier alnifolia var. humptulipensis | Many-flowered Shadbush Saskatoon Serviceberry | |
| Amelanchier alnifolia var. semiintegrifolia | Pacific Serviceberry Saskatoon Serviceberry | |
| Amelanchier arborea | Common Serviceberry Downy Serviceberry Shadbush Juneberry Junebush Shadblow Sarvis | |
| Amelanchier arborea var. alabamensis | Alabama Serviceberry | |
| Amelanchier arborea var. arborea | Common Serviceberry Shadbush Junebush | |
| Amelanchier arborea var. austromontana | Downy Serviceberry Thicket Shadbush | |
| Amelanchier bartramiana | Oblongfruit Serviceberry | |
| Amelanchier canadensis | Canadian Serviceberry Canadian Service-berry Shadblow Serviceberry Juneberry Shadbush Junebush | |
| Amelanchier humilis | Low Serviceberry Low Shadblow | |
| scientific name | common name(s) | image gallery |
