Complete list of species
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| scientific name | common name(s) | image gallery |
| Xylorhiza glabriuscula var. villosa | Villous Woody-aster Villous Woodyaster | |
| Xylorhiza orcuttii | Orcutt's Aster Borrego Aster Mojave Aster | |
| Xylorhiza tortifolia | Mojave Woodyaster Mojave Aster Desert Aster | |
| Xylorhiza tortifolia var. imberbis | Imberis Woodyaster Smooth Mojave Woody-aster | |
| Xylorhiza tortifolia var. parashantensis | Parashant Woody-aster Parashant Woodyaster | |
| Xylorhiza tortifolia var. tortifolia | Mojave Woody-aster Mojave Aster | |
| Xylorhiza venusta | Charming Woody-aster Charming Woodyaster | |
| Xylorhiza wrightii | Big Bend Woodyaster Terlingua Aster Gyp Daisy Gypsum Daisy Big Bend Aster | |
| Xylosma buxifolia | Mucha-gente | |
| Xylosma crenata | Sawtooth Logwood | |
| Xylosma flexuosa | Brush Holly Brushholly | |
| Xylosma hawaiiensis | Maua | |
| Xylothamia palmeri | Texas Desert Goldenrod Texas Goldenweed | |
| Xylothamia triantha | Trans Pecos Goldenshrub Trans-Pecos Desert Goldenrod | |
| Xyris ambigua | Coastal Plain Yelloweyed Grass Coastalplain Yelloweyed Grass | |
| Xyris baldwiniana | Baldwin's Yelloweyed Grass | |
| Xyris brevifolia | Shortleaf Yelloweyed Grass Short-leaf Yellow-eyed-grass | |
| Xyris calcicola | Marl Yelloweyed Grass Marl Yellow-eyed Grass | |
| Xyris caroliniana | Carolina Yelloweyed Grass | |
| Xyris chapmanii | Chapman's Yelloweyed Grass Chapman's Yellow-eyed-grass | |
| Xyris correlliorum | Correll's Yelloweyed Grass Correll's Yellow-eyed Grass Correll's Yellow-eyed-grass | |
| Xyris difformis | Bog Yelloweyed Grass | |
| Xyris difformis var. curtissii | Curtiss' Yelloweyed Grass Curtiss' Yellow-eyed Grass Carolina Yellow-eyed-grass | |
| Xyris difformis var. difformis | Bog Yelloweyed Grass | |
| Xyris drummondii | Drummond's Yelloweyed Grass Drummond's Yellow-eyed Grass Drummond's Yellow-eyed-grass | |
| Xyris elliottii | Elliott's Yelloweyed Grass Elliott's Yellow-eyed Grass Elliott's Yellow-eyed-grass | |
| Xyris fimbriata | Fringed Yelloweyed Grass | |
| Xyris flabelliformis | Savannah Yelloweyed Grass Savannah Yellow-eyed Grass Savannah Yellow-eyed-grass | |
| Xyris floridana | Florida Yelloweyed-Grass Florida Yellow-eyed Grass Florida Yellow-eyed-grass | |
| Xyris isoetifolia | Quillwort Yelloweyed Grass Quillwort Yellow-eyed Grass Quillwort Yellow-eyed-grass | |
| Xyris jupicai | Richard's Yelloweyed Grass | |
| Xyris laxifolia | Laxleaf Yelloweyed Grass Laxleaf Yellow-eyed Grass Lax-leaf Yellow-eyed-grass | |
| Xyris laxifolia var. iridifolia | Irisleaf Yelloweyed Grass | |
| Xyris longisepala | Kral's Yelloweyed Grass Kral's Yellow-eyed Grass Karst Pond Yellow-eyed-grass | |
| Xyris louisianica | Louisiana Yelloweyed Grass | |
| Xyris montana | Northern Yelloweyed Grass | |
| Xyris panacea | St. Marks Yelloweyed Grass St. Marks Yellow-eyed Grass St. Mark's Yellow-eyed-grass | |
| Xyris platylepis | Tall Yelloweyed Grass Broad-scale Yellow-eyed Grass | |
| Xyris scabrifolia | Harper's Yelloweyed Grass Harper's Yellow-eyed Grass Harper's Yellow-eyed-grass | |
| Xyris serotina | Acidswamp Yelloweyed Grass Acid Swamp Yellow-eyed Grass Acid-swamp Yellow-eyed-grass | |
| Xyris smalliana | Small's Yelloweyed Grass Small's Yellow-eyed Grass Small's Yellow-eyed-grass | |
| Xyris stricta | Pineland Yelloweyed Grass Pineland Yellow-eyed Grass Pineland Yellow-eyed-grass | |
| Xyris tennesseensis | Tennessee Yellow-eyed-grass | |
| Xyris torta | Twisted Yellow-eyed Grass Slender Yellow-eyed Grass | |
| Yabea microcarpa | False Carrot Falsecarrot California Hedge Parsley False Hedge-parsley | |
| Yeatesia platystegia | Montell Bractspike Wild Shrimp Plant | |
| Yeatesia viridiflora | Yellow Bractspike | |
| Yermo xanthocephalus | Desert Yellow-head Desert Yellowhead Yermo | |
| Yucca aloifolia | Spanish Dagger Spanish Bayonet Aloe Yucca | |
| Yucca angustissima | Narrowleaf Yucca | |
| Yucca angustissima var. angustissima | Narrowleaf Yucca | |
| Yucca angustissima var. kanabensis | Kanab Yucca | |
| Yucca angustissima var. toftiae | Toft's Yucca | |
| Yucca arkansana | Arkansas Yucca Softleaf Yucca | |
| Yucca baccata | Banana Yucca Blue Yucca Fleshy-fruited Yucca Datil | |
| Yucca baileyi | Navajo Yucca Bailey's Narrow Leaf Yucca Alpine Yucca | |
| Yucca baileyi var. baileyi | Alpine Yucca Navajo Yucca | |
| Yucca baileyi var. intermedia | Intermediate Yucca | |
| Yucca baileyi var. navajoa | Navajo Yucca | |
| Yucca brevifolia | Joshua Tree Tree Yucca Cactus-yucca Yucca-palm | |
| Yucca brevifolia var. brevifolia | Cactus-yucca Joshua Tree Tree Yucca Yucca-palm | |
| Yucca brevifolia var. jaegeriana | Jaeger's Joshua Tree | |
| Yucca campestris | Plains Yucca | |
| Yucca constricta | Buckley Yucca Buckley's Yucca | |
| Yucca elata | Soaptree Yucca Soaptree Soapweed Yucca Palmilla Palmella Amole | |
| Yucca faxoniana | Faxon Yucca Carneros Yucca Eve's Needle Spanish Bayonet Spanish Dagger Giant Dagger Palm Samandoca Palm Barreta Palmilla Palma | |
| Yucca filamentosa | Adam's Needle | |
| Yucca flaccida | Weak-leaf Yucca Beargrass | |
| Yucca glauca | Soapweed Yucca Narrowleaf Yucca Plains Yucca Beargrass Great Plains Yucca | |
| Yucca glauca var. glauca | Soapweed Yucca Narrow-leaf Yucca | |
| Yucca glauca var. gurneyi | Gurney's Yucca | |
| Yucca gloriosa | Moundlily Yucca | |
| Yucca harrimaniae | Spanish Bayonet | |
| Yucca harrimaniae var. harrimaniae | Spanish Bayonet Salt Lake Desert Yucca | |
| Yucca harrimaniae var. neomexicana | New Mexico Spanish Bayonet New Mexico Yucca | |
| Yucca harrimaniae var. sterilis | Spanish Bayonet | |
| Yucca louisianensis | Gulf Coast Yucca | |
| Yucca madrensis | Mountain Yucca Hoary Yucca Sword-cactus | |
| Yucca necopina | Brazos River Yucca Glen Rose Yucca | |
| Yucca pallida | Pale-leaf Yucca | |
| Yucca recurvifolia | Curve-leaf Yucca | |
| Yucca reverchonii | San Angelo Yucca | |
| Yucca rupicola | Twistleaf Yucca Twisted-leaf Yucca Texas Yucca Spanish Dagger | |
| Yucca schidigera | Mojave Yucca | |
| Yucca ×schottii | Schott's Yucca Arizona-soapwort | |
| Yucca tenuistyla | White-rimmed Yucca Whiterim Yucca | |
| Yucca thompsoniana | Thompson's Yucca Thompson Yucca Beaked Yucca Big Bend Yucca Soyate Palmita Trans-Pecos Yucca | |
| Yucca torreyi | Torrey Yucca Torrey's Yucca Spanish Bayonet Spanish Dagger Old Shag Palma | |
| Yucca treculeana | Spanish Dagger Spanish Bayonet Don Quixote's Lance Palma Pita Palma De Datil Palmito | |
| Yucca treculeana var. succulenta | Don Quixote's Lace Palma Pita Spanish Dagger | |
| Yucca treculeana var. treculeana | Don Quixote's Lace Palma Pita Spanish Dagger | |
| Zamia pumila | Coontie Florida Arrowroot | |
| Zamia pumila ssp. pumila | Coontie | |
| Zannichellia palustris | Horned Pondweed Horned Poolmat Horned-pondweed | |
| Zanthoxylum americanum | Common Pricklyash Toothache Tree Prickly Ash | |
| Zanthoxylum clava-herculis | Hercules Club Pepperbark Toothache Tree Tickle Tongue Prickly Ash | |
| Zanthoxylum coriaceum | Biscayne Pricklyash Leathery Prickly-ash | |
| Zanthoxylum dipetalum | Kawa'u Kawa'u Kua Kuku Kapa Ae Hea'e Manele | |
| Zanthoxylum dipetalum var. dipetalum | Kawa'u Ae Hea'e Manele | |
| Zanthoxylum dipetalum var. tomentosum | Kawa'u Ae Hea'e Manele | |
| scientific name | common name(s) | image gallery |
