Complete list of species
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| scientific name | common name(s) | image gallery |
| Acanthomintha obovata ssp. obovata | San Benito Thorn-mint San Benito Thornmint San Benito Thorn Mint | |
| Acer circinatum | Oregon Vine Maple Vine Maple | |
| Acer floridanum | Southern Sugar Maple Florida Maple Caddo Maple Rock Maple | |
| Acer glabrum | Rocky Mountain Maple | |
| Acer glabrum var. diffusum | Mountain Maple Rocky Mountain Maple | |
| Acer glabrum var. douglasii | Douglas Maple | |
| Acer glabrum var. glabrum | Rocky Mountain Maple Western Mountain Maple Dwarf Maple | |
| Acer glabrum var. greenei | Greene's Maple Greene's Mountain Maple | |
| Acer glabrum var. neomexicanum | New Mexico Maple | |
| Acer glabrum var. torreyi | Torrey Maple Torrey's Mountain Maple | |
| Acer grandidentatum | Bigtooth Maple Big-toothed Maple Uvalde Bigtooth Maple Southwestern Bigtooth Maple Canyon Maple Sabinal Maple Western Sugar Maple | |
| Acer grandidentatum var. grandidentatum | Bigtooth Maple Uvalde Bigtooth Maple | |
| Acer grandidentatum var. sinuosum | Canyon Maple | |
| Acer leucoderme | Chalk Maple Whitebark Maple | |
| Acer macrophyllum | Bigleaf Maple Big-leaf Maple | |
| Acer negundo | Box Elder Box Elder Maple Ash-leaved Maple Ashleaf Maple Red River Maple Fresno De Guajuco | |
| Acer negundo var. arizonicum | Arizona Box Elder Arizona Boxelder | |
| Acer negundo var. californicum | California Box Elder California Boxelder | |
| Acer negundo var. interius | Boxelder Boxelder Maple Ash-leaf Maple | |
| Acer negundo var. negundo | Boxelder Ashleaf Maple Boxelder Maple Three-leaf Maple | |
| Acer negundo var. texanum | Boxelder Ashleaf Maple Boxelder Maple | |
| Acer negundo var. violaceum | Box Elder Boxelder | |
| Acer nigrum | Black Maple | |
| Acer pensylvanicum | Striped Maple Moosewood | |
| Acer rubrum | Red Maple Scarlet Maple Soft Maple | |
| Acer rubrum var. drummondii | Drummond's Maple Drummond Red Maple Swamp Maple | |
| Acer rubrum var. rubrum | Red Maple | |
| Acer rubrum var. trilobum | Trident Maple Trident Red Maple | |
| Acer saccharinum | Silver Maple Soft Maple White Maple | |
| Acer saccharum | Sugar Maple Northern Sugar Maple | |
| Acer saccharum var. saccharum | Sugar Maple | |
| Acer saccharum var. schneckii | Sugar Maple | |
| Acer spicatum | Mountain Maple | |
| Acer ×freemanii | Freeman Maple Freeman's Maple | |
| Achillea alpina | Chinese Yarrow Siberian Yarrow | |
| Achillea millefolium | Common Yarrow Western Yarrow Yarrow Milfoil | |
| Achillea millefolium var. alpicola | Common Yarrow | |
| Achillea millefolium var. arenicola | Common Yarrow Northern Yarrow | |
| Achillea millefolium var. borealis | Boreal Yarrow | |
| Achillea millefolium var. californica | California Yarrow Nosebleed Woundwort Little Feather | |
| Achillea millefolium var. gigantea | Giant Yarrow Nosebleed Woundwort Little Feather | |
| Achillea millefolium var. litoralis | Coast Yarrow Nosebleed Woundwort Little Feather | |
| Achillea millefolium var. megacephala | Common Yarrow Nosebleed Woundwort Little Feather | |
| Achillea millefolium var. nigrescens | Common Yarrow Nosebleed Woundwort Little Feather | |
| Achillea millefolium var. occidentalis | Western Yarrow Woolly Yarrow White Yarrow | |
| Achillea millefolium var. pacifica | Pacific Yarrow Nosebleed Woundwort Little Feather | |
| Achillea millefolium var. puberula | Common Yarrow Nosebleed Woundwort Little Feather | |
| Achillea sibirica | Siberian Yarrow | |
| Achlys californica | California Deer Foot Deer's Foot | |
| Achlys triphylla | Sweet After Death Sweet-after-death Vanilla Leaf | |
| Achnatherum aridum | Mormon Needle Grass Mormon Needlegrass | |
| Achnatherum contractum | Contracted Ricegrass | |
| Achnatherum coronatum | Giant Ricegrass Giant Rice Grass Needle-and-thread Grass | |
| Achnatherum curvifolium | Curlyleaf Needle Grass Curlyleaf Needlegrass Guadalupe Ricegrass | |
| Achnatherum diegoense | San Diego County Needle Grass San Diego Needlegrass | |
| Achnatherum eminens | Southwestern Needle Grass Southwestern Needlegrass Southwestern Rice Grass | |
| Achnatherum hendersonii | Henderson's Needle Grass Henderson's Needlegrass | |
| Achnatherum hymenoides | Indian Ricegrass Indian Millet Sandgrass | |
| Achnatherum latiglume | Sierra Needlegrass Wide-glumed Needle Grass | |
| Achnatherum lemmonii | Lemmon's Needle Grass Lemmon's Needlegrass | |
| Achnatherum lemmonii var. lemmonii | Lemmon's Needle Grass Lemmon's Needlegrass | |
| Achnatherum lemmonii var. pubescens | Pubescent Lemmon's Needle Grass Pubescent Lemmon's Needlegrass | |
| Achnatherum lettermanii | Letterman's Needlegrass | |
| Achnatherum lobatum | Lobed Needlegrass Littleawn Needlegrass | |
| Achnatherum nelsonii | Columbia Needlegrass Mountain Needle Grass | |
| Achnatherum nelsonii ssp. dorei | Dore's Needlegrass Columbia Needlegrass | |
| Achnatherum nelsonii ssp. nelsonii | Columbia Needlegrass Mountain Needle Grass | |
| Achnatherum nevadense | Nevada Needle Grass Nevada Needlegrass | |
| Achnatherum occidentale | Western Needle Grass Western Needlegrass | |
| Achnatherum occidentale ssp. californicum | California Needle Grass California Needlegrass | |
| Achnatherum occidentale ssp. occidentale | Western Needle Grass Western Needlegrass | |
| Achnatherum occidentale ssp. pubescens | Common Western Needle Grass Pubescent Western Needlegrass | |
| Achnatherum parishii | Parish's Needle Grass Parish's Needlegrass | |
| Achnatherum parishii var. depauperatum | Little Parish's Needlegrass Little Parish's Needle Grass | |
| Achnatherum parishii var. parishii | Parish's Needle Grass Parish's Needlegrass | |
| Achnatherum perplexum | New Mexico Needle Grass New Mexico Needlegrass | |
| Achnatherum pinetorum | Pine Needlegrass Pinewoods Needle Grass Pinewoods Needlegrass | |
| Achnatherum richardsonii | Richardson's Needlegrass | |
| Achnatherum robustum | Sleepygrass | |
| Achnatherum scribneri | Scribner Needle Grass Scribner Needlegrass | |
| Achnatherum speciosum | Desert Needlegrass Desert Rice Grass Spear Grass | |
| Achnatherum stillmanii | Stillman's Needle Grass Stillman's Needlegrass | |
| Achnatherum swallenii | Swallen's Needle Grass Swallen's Needlegrass | |
| Achnatherum thurberianum | Thurber's Needle Grass Thurber's Needlegrass | |
| Achnatherum wallowaense | Wallowa Needle Grass Wallowa Needlegrass | |
| Achnatherum webberi | Webber Needlegrass Webber's Needle Grass | |
| Achnatherum ×bloomeri | Bloomer Ricegrass Bloomer's Ricegrass | |
| Achyrachaena mollis | Blow Wives | |
| Achyranthes mutica | Blunt Chaff Flower Blunt Chaff-flower | |
| Achyranthes splendens | Maui Chaff Flower Maui Chaff-flower Round Chaff Flower Round-leaved Chaff Flower | |
| Achyranthes splendens var. atollensis | Hawaii Chaff Flower Hawaii Chaff-flower | |
| Achyranthes splendens var. rotundata | Maui Chaff Flower Maui Chaff-flower Round-leaved Chaff-flower | |
| Achyranthes splendens var. splendens | Maui Chaff Flower Maui Chaff-flower Round-leaved Chaff-flower | |
| Achyronychia cooperi | Onyxflower Frost Mat Cooper's Frostmat | |
| Acleisanthes acutifolia | Needletip Trumpets | |
| Acleisanthes anisophylla | Obliqueleaf Trumpets Oblique-leaf Trumpets | |
| Acleisanthes crassifolia | Texas Trumpets | |
| Acleisanthes longiflora | Angel's Trumpets Angel Trumpets | |
| Acleisanthes obtusa | Berlandier's Trumpets Vine Four O'Clock | |
| Acleisanthes wrightii | Wright's Trumpets | |
| scientific name | common name(s) | image gallery |
