Complete list of species
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| scientific name | common name(s) | image gallery |
| Eschscholzia californica | California Poppy California Gold Poppy | |
| Eschscholzia californica ssp. californica | California Poppy | |
| Eschscholzia californica ssp. mexicana | Mexican Gold Poppy California Poppy | |
| Eschscholzia glyptosperma | Desert Poppy | |
| Eschscholzia hypecoides | Leafy Stemmed Poppy San Benito Golden-poppy San Benito Poppy | |
| Eschscholzia lemmonii | Lemmon's Golden-poppy Lemmon's Poppy | |
| Eschscholzia lemmonii ssp. kernensis | Tejon Poppy | |
| Eschscholzia lemmonii ssp. lemmonii | Lemmon's Poppy | |
| Eschscholzia lobbii | Frying Pans Frying-pans Fryingpans | |
| Eschscholzia minutiflora | Pygmy Poppy | |
| Eschscholzia minutiflora ssp. covillei | Coville's Goldenpoppy Coville's Poppy Coville's Pygmy Poppy | |
| Eschscholzia minutiflora ssp. minutiflora | Pygmy Poppy Smallflower Goldenpoppy | |
| Eschscholzia minutiflora ssp. twisselmannii | Red Rock Poppy | |
| Eschscholzia papastillii | Cryptic Desert Golden-poppy Cryptic Desert Goldenpoppy Cryptic Desert Poppy | |
| Eschscholzia parishii | Desert Poppy Parish's Golden-poppy Parish's Poppy Pygmy Poppy | |
| Eschscholzia ramosa | Channel Island Golden-poppy Channel Island Poppy Island-poppy | |
| Eschscholzia rhombipetala | Diamond Petaled California Poppy Diamond-petal Golden-poppy Diamondpetal California Poppy | |
| Escobaria albicolumnaria | Column Foxtail Cactus Silver-lace Cob Cactus White Column | |
| Escobaria alversonii | Cushion Foxtail Cactus Foxtail Cactus Foxtail Beehive Cactus | |
| Escobaria dasyacantha | Big Bend Foxtail Cactus Cob Cactus White-column Foxtail Cactus | |
| Escobaria dasyacantha var. chaffeyi | Chaffey's Foxtail Cactus | |
| Escobaria dasyacantha var. dasyacantha | Big Bend Foxtail Cactus Big Bend Cactus | |
| Escobaria duncanii | Duncan's Foxtail Cactus | |
| Escobaria emskoetteriana | Junior Tom Thumb Cactus | |
| Escobaria guadalupensis | Carpet Foxtail Cactus Guadalupe Mountain Foxtail Cactus | |
| Escobaria hesteri | Hester's Foxtail Cactus Hester’s Pincushion Cactus | |
| Escobaria minima | Nellie Cory Cactus Nellie’s Pincushion Cactus | |
| Escobaria missouriensis | Missouri Foxtail Cactus Plains Nipple Cactus | |
| Escobaria orcuttii | Orcutt's Foxtail Cactus Snowball Cactus | |
| Escobaria orcuttii var. koenigii | Koenig Snowball Cactus Orcutt's Foxtail Cactus | |
| Escobaria orcuttii var. macraxima | Orcutt's Foxtail Cactus Snowball Cactus | |
| Escobaria orcuttii var. orcuttii | Orcutt's Foxtail Cactus Snowball Cactus | |
| Escobaria organensis | Organ Mountain Foxtail Cactus | |
| Escobaria robbinsiorum | Cochise Foxtail Cactus Cochise Pincushion Cactus | |
| Escobaria sandbergii | San Andres Mountain Foxtail Cactus | |
| Escobaria sneedii | Carpet Foxtail Cactus Sneed's Foxtail Cactus Sneed's Pincushion Cactus | |
| Escobaria sneedii var. leei | Carpet Foxtail Cactus Lee's Pincushion Cactus Sneed's Pincushion Cactus | |
| Escobaria sneedii var. sneedii | Carpet Foxtail Cactus Sneed's Foxtail Cactus Sneed's Pincushion Cactus | |
| Escobaria tuberculosa | Whitecolumn Foxtail Cactus Cob Beehive Cactus White-column Foxtail Cactus White Star | |
| Escobaria tuberculosa var. tuberculosa | Whitecolumn Foxtail Cactus | |
| Escobaria tuberculosa var. varicolor | Whitecolumn Foxtail Cactus | |
| Escobaria villardii | Sacramento Mountain Foxtail Cactus | |
| Escobaria vivipara | Spinystar Common Beehive Cactus Pincushion Cactus | |
| Escobaria vivipara var. arizonica | Arizona Spinystar Arizona Foxtail Cactus | |
| Escobaria vivipara var. bisbeeana | Bisbee Spinystar | |
| Escobaria vivipara var. buoflama | Spinystar | |
| Escobaria vivipara var. deserti | Desert Spinystar | |
| Escobaria vivipara var. kaibabensis | Kaibab Spinystar | |
| Escobaria vivipara var. neomexicana | New Mexico Spinystar | |
| Escobaria vivipara var. radiosa | Spinystar | |
| Escobaria vivipara var. rosea | Spinystar | |
| Escobaria vivipara var. vivipara | Spinystar | |
| Esenbeckia berlandieri | Berlandier's Jopoy Berlandier Jopoy Jopoy Berlandier's Esenbeckia Berlandier Esenbeckia Runyon Esenbeckia | |
| Eubotrys racemosus | Swamp Sweetbells Swamp Doghobble Sweetbells Leucothoe Sweetbells Deciduous Swamp Fetterbush Coastal Fetterbush Swamp Leucothoe | |
| Eubotrys recurvus | Mountain Fetterbush Redtwig Doghobble Recurved Doghobble | |
| Eucephalus breweri | Brewer's Aster | |
| Eucephalus brickellioides | Brickellbush Aster | |
| Eucephalus elegans | Elegant Aster | |
| Eucephalus engelmannii | Engelmann's Aster | |
| Eucephalus glabratus | Siskiyou Aster Smooth Aster | |
| Eucephalus glaucescens | Klickitat Aster | |
| Eucephalus gormanii | Gorman's Aster | |
| Eucephalus ledophyllus | Cascade Aster | |
| Eucephalus ledophyllus var. covillei | Cascade Aster | |
| Eucephalus ledophyllus var. ledophyllus | Cascade Aster Cascade Wayside-aster | |
| Eucephalus paucicapitatus | Olympic Mountain Aster | |
| Eucephalus tomentellus | Brickellbush Aster Rayless Aster | |
| Eucephalus vialis | Wayside Aster | |
| Eucnide bartonioides | Yellow Rocknettle Rocknettle Yellow Stingbush | |
| Eucnide bartonioides var. bartonioides | Yellow Stingbush Yellow Rock Nettle | |
| Eucnide bartonioides var. edwardsiana | Edwards Plateau Yellow Stingbush | |
| Eucnide lobata | Lobed-leaf Stingbush Moon-leaf Stingbush | |
| Eucnide rupestris | Rock Nettle Rock Stingbush | |
| Eucnide urens | Desert Stingbush Desert Rock-nettle | |
| Eucrypta chrysanthemifolia | Spotted Hideseed Spotted Eucrypta Common Eucrypta | |
| Eucrypta chrysanthemifolia var. bipinnatifida | Spotted Hideseed Common Eucrypta Torrey Eucrypta | |
| Eucrypta chrysanthemifolia var. chrysanthemifolia | Spotted Hideseed Common Eucrypta Torrey Eucrypta | |
| Eucrypta micrantha | Dainty Desert Hideseed Desert Hideseed Desert Eucrypta Small Flowered Eucrypta | |
| Eugenia axillaris | White Stopper | |
| Eugenia confusa | Red-berry Stopper Redberry Eugenia Redberry Stopper | |
| Eugenia foetida | Boxleaf Stopper Spanish Stopper | |
| Eugenia koolauensis | Nioi Ko'olau Eugenia | |
| Eugenia reinwardtiana | Beach Cherry Cedar Bay Cherry Mountain Stopper Nioi Reinwardt's Cherry | |
| Eugenia rhombea | Red Stopper | |
| Eulophia alta | Wild Coco | |
| Euonymus americanus | American Strawberry Bush Strawberry Bush Brook Euonymus Hearts-a-burstin Bursting Heart Wahoo | |
| Euonymus atropurpureus | Burningbush Eastern Wahoo Burning Bush Wahoo Waahoo Whahoo Spindle Tree | |
| Euonymus atropurpureus var. atropurpureus | Eastern Wahoo | |
| Euonymus atropurpureus var. cheatumii | Eastern Wahoo | |
| Euonymus obovatus | Running Strawberry Bush Running Euonymus | |
| Euonymus occidentalis | Western Burning Bush Western Spindle-tree Western Wahoo | |
| Euonymus occidentalis var. occidentalis | Western Burning Bush Western Wahoo | |
| Euonymus occidentalis var. parishii | Parish's Burning Bush Western Burning Bush Western Wahoo | |
| Eutrochium maculatum var. maculatum | Spotted Trumpetweed Spotted Joe-pye-weed | |
| Eupatorium album | White Thoroughwort | |
| Eupatorium album var. album | White Thoroughwort | |
| Eupatorium album var. subvenosum | White Thoroughwort | |
| Eupatorium altissimum | Tall Thoroughwort Tall Boneset | |
| Eupatorium anomalum | Florida Thoroughwort | |
| Eupatorium capillifolium | Dogfennel Dog Fennel | |
| scientific name | common name(s) | image gallery |
