Complete list of species
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| scientific name | common name(s) | image gallery |
| Encelia resinifera ssp. resinifera | Button Brittlebush | |
| Encelia resinifera ssp. tenuifolia | Sticky Brittlebush | |
| Encelia scaposa | Onehead Brittlebush | |
| Encelia virginensis | Virgin River Brittlebush | |
| Enceliopsis argophylla | Silverleaf Sunray | |
| Enceliopsis covillei | Panamint Daisy Sunray | |
| Enceliopsis nudicaulis | Nakedstem Sunray Sunray | |
| Enceliopsis nudicaulis var. corrugata | Naked-stemmed Daisy Nakedstem Sunray | |
| Enceliopsis nudicaulis var. nudicaulis | Naked-stemmed Daisy Nakedstem Sunray | |
| Encyclia tampensis | Tampa Butterfly Orchid Butterfly Orchid | |
| Endolepis covillei | Coville's Endolepis Coville's Orach Coville's Orache | |
| Endolepis dioica | Suckley's Endolepis Suckley’s Orach Suckley’s Orache | |
| Enemion biternatum | Eastern False Rue Anemone Isopyrum | |
| Enemion hallii | Willamette False Rue Anemone Willamette False Rue-anemone Willamette Rue-anemone | |
| Enemion occidentale | Western False Rue Anemone Western False Rue-anemone Western Rue-anemone | |
| Enemion savilei | Queen Charlotte Island False Rue Anemone Queen Charlotte Island False Rue-anemone Queen Charlotte Islands False Rue-anemone | |
| Enemion stipitatum | Siskiyou False Rue Anemone Siskiyou False Rue-anemone Siskiyou Rue-anemone | |
| Engelmannia peristenia | Engelmann's Daisy Engelmann Daisy Cutleaf Daisy | |
| Enneapogon desvauxii | Feather Pappusgrass Nine-awn Grass Nine-awned Pappus Grass Nineawn Pappusgrass | |
| Enteropogon chlorideus | Bury-seed Umbrella Grass Buryseed Umbrellagrass Windmill Grass | |
| Ephedra antisyphilitica | Mormon Tea Joint-fir Clapweed Popote | |
| Ephedra aspera | Rough Jointfir | |
| Ephedra californica | California Joint Fir | |
| Ephedra coryi | Cory's Jointfir Cory's Ephedra | |
| Ephedra cutleri | Cutler's Joint Fir Cutler's Mormon Tea | |
| Ephedra funerea | Death Valley Ephedra Death Valley Jointfir Death Valley Mormon Tea Funera Mormon Tea | |
| Ephedra nevadensis | Nevada Jointfir Nevada Joint-fir | |
| Ephedra pedunculata | Vine Jointfir | |
| Ephedra torreyana | Torrey's Jointfir Torrey Joint-fir | |
| Ephedra torreyana var. powelliorum | Torrey's Jointfir | |
| Ephedra torreyana var. torreyana | Torrey's Jointfir Torrey's Mormon Tea | |
| Ephedra trifurca | Ephedra Mormon Tea Longleaf Jointfir Jointfir Longleaf Teabush Tea Weed Canutillo | |
| Ephedra viridis | Mormon Tea | |
| Ephedra ×arenicola | Sand Jointfir Sand Mormon Tea Sandy Jointfir | |
| Ephedra ×intermixta | Intermixed Jointfir Mixed Jointfir Mixed Mormon Tea | |
| Epidendrum acunae | Acuna's Star Orchid | |
| Epidendrum amphistomum | Big-mouth Star Orchid Dingy-flowered Star Orchid Surrounded-mouth Epidendrum | |
| Epidendrum boricuarum | Fleshy Star Orchid | |
| Epidendrum floridense | Florida Star Orchid | |
| Epidendrum magnoliae | Green Fly Orchid Green-fly Orchid | |
| Epidendrum magnoliae var. magnoliae | Green Fly Orchid Greenfly Orchid | |
| Epidendrum nocturnum | Night Scented Orchid Night Fragrant Epidendrum | |
| Epidendrum rigidum | Stiff-flower Star Orchid Rigid Epidendrum | |
| Epidendrum strobiliferum | Big Cypress Star Orchid Cone Bearing Epidendrum Pine-cone Epidendrum | |
| Epifagus virginiana | Beechdrops | |
| Epigaea repens | Trailing Arbutus Mayflower Plymouth Mayflower | |
| Epilobium anagallidifolium | Pimpernel Willowherb | |
| Epilobium arcticum | Arctic Willowherb Fireweed | |
| Epilobium brachycarpum | Tall Annual Willowherb | |
| Epilobium canum | Hummingbird Trumpet California Fuchsia Zauschneria | |
| Epilobium canum ssp. angustifolium | Hummingbird Trumpet California Fuchsia | |
| Epilobium canum ssp. canum | Hummingbird Trumpet California Fuchsia Zauschneria | |
| Epilobium canum ssp. garrettii | Garrett's Firechalice Hummingbird Trumpet | |
| Epilobium canum ssp. latifolium | Hummingbird Trumpet Hummingbird-trumpet | |
| Epilobium ciliatum | Fringed Willowherb | |
| Epilobium ciliatum ssp. ciliatum | Fringed Willowherb | |
| Epilobium ciliatum ssp. glandulosum | Fringed Willowherb | |
| Epilobium ciliatum ssp. watsonii | Fringed Willowherb | |
| Epilobium clavatum | Club Fruit Willowherb Talus Willowherb | |
| Epilobium cleistogamum | Cleistogamous Boisduvalia Selfing Willowherb | |
| Epilobium coloratum | Purpleleaf Willowherb | |
| Epilobium davuricum | Dahurian Willowherb Northern Swamp Willowherb | |
| Epilobium densiflorum | Dense Boisduvalia Dense Flowered Spike Primrose Dense-flower Spike-primrose Denseflower Willowherb Denseflower Willowweed | |
| Epilobium foliosum | California Willowherb Leafy Willowherb | |
| Epilobium glaberrimum | Glaucous Willow Herb Glaucus Willowherb Smooth Willowherb Smooth Willowweed | |
| Epilobium glaberrimum ssp. fastigiatum | Cluster Stemmed Willowherb Glaucus Willowherb Smooth Willowherb Smooth Willowweed | |
| Epilobium glaberrimum ssp. glaberrimum | Glaucus Willowherb Smooth Willowherb Smooth Willowweed | |
| Epilobium halleanum | Glandular Willowherb Hall's Willowherb Hall's Willowweed | |
| Epilobium hornemannii | Hornemann's Willowherb | |
| Epilobium hornemannii ssp. behringianum | Hornemann's Willowherb Hornemann's Willowweed | |
| Epilobium hornemannii ssp. hornemannii | Hornemann's Willowherb | |
| Epilobium howellii | Subalpine Fireweed Yuba Pass Willowherb | |
| Epilobium lactiflorum | Milkflower Willowherb | |
| Epilobium leptocarpum | Slenderfruit Willowherb Small-flowered Willow Herb | |
| Epilobium leptophyllum | Bog Willowherb | |
| Epilobium luteum | Yellow Willowherb | |
| Epilobium minutum | Chaparral Willowherb Desert Willow Herb Little Willowherb Minute Willowherb Minute Willowweed Slender Annual Fireweed | |
| Epilobium mirabile | Hairy-stemmed Willowherb Olympic Mountain Willowherb | |
| Epilobium nevadense | Nevada Willowherb Nevada Willowweed | |
| Epilobium nivium | Snow Mountain Willowherb | |
| Epilobium obcordatum | Rockfringe | |
| Epilobium oreganum | Grants Pass Willowherb Oregon Fireweed | |
| Epilobium oregonense | Oregon Willowherb Oregon Willowweed Slimstem Willowweed | |
| Epilobium pallidum | Large-flower Willowherb Largeflower Spike Primrose Largeflower Spike-primrose Pale Boisduvalia | |
| Epilobium palustre | Marsh Willowherb | |
| Epilobium pygmaeum | Smooth Boisduvalia Smooth Spike Primrose Smooth Spike-primrose Smooth Willowweed | |
| Epilobium rigidum | Stiff Willowherb Siskiyou Rock Fringe | |
| Epilobium saximontanum | Glandular Willowherb Rocky Mountain Willowherb Rocky Mountain Willowweed | |
| Epilobium septentrionale | Northern Willowherb Humboldt County Fuchsia | |
| Epilobium siskiyouense | Siskiyou Fireweed Siskiyou Rock-fringe Siskiyou Willowherb | |
| Epilobium strictum | Downy Willowherb | |
| Epilobium suffruticosum | Shrubby Willowherb | |
| Epilobium torreyi | Brook Willowherb Narrow Boisduvalia Narrow Leaved Boisduvalia Narrowleaf Willowweed Torrey's Willowherb | |
| Epilobium ×pulchrum | Willowherb | |
| Epilobium ×treleaseanum | Trelease's Hybrid Willowherb | |
| Epilobium ×wisconsinense | Willowherb Wisconsin Hybrid Willowherb | |
| Epipactis gigantea | Stream Orchid Chatterbox Orchid Giant Hellebore | |
| Epithelantha bokei | Pingpong Ball Cactus | |
| Epithelantha micromeris | Pingpong Ball Cactus Button Cactus | |
| Epixiphium wislizeni | Balloonbush Net-cup Snapdragon Vine Balloon-sepal Snapdragon Vine | |
| scientific name | common name(s) | image gallery |
