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 | |
| scientific name | common name(s) | image gallery |
