Complete list of species
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| scientific name | common name(s) | image gallery |
| 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 | Oblique-leaf Trumpets Obliqueleaf 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 |
