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| scientific name | common name(s) | image gallery |
| Dalea multiflora | Roundhead prairie clover White prairie clover Round headed dalea Round headed clover | |
| Dalea nana | Dwarf prairie clover Dwarf Dalea | |
| Dalea nana var. carnescens | Dwarf prairie clover | |
| Dalea obovata | Pussyfoot | |
| Dalea phleoides var. microphylla | Slimspike prairie clover | |
| Dalea pinnata | Summer farewell | |
| Dalea pogonathera | Bearded dalea Bearded prairie clover | |
| Dalea pulchra | Pretty dalea Bush dalea Santa Catalina prairie clover | |
| Dalea purpurea | Purple prairie clover | |
| Dalea purpurea var. purpurea | Purple prairie clover Violet prairie clover | |
| Dalea tenuis | Pinkglobe prairie clover | |
| Dalea villosa | Silky prairie clover | |
| Dalea villosa var. villosa | Silky prairie clover | |
| Dalea wrightii | Wright's prairie clover | |
| Delphinium tricorne | Dwarf larkspur Spring larkspur | |
| Echinacea angustifolia | Black Sampson Black Samson echinacea Narrow-leaf Coneflower | |
| Echinacea angustifolia var. angustifolia | Blacksamson echinacea | |
| Echinacea atrorubens | Topeka purple coneflower | |
| Echinacea laevigata | Smooth purple coneflower | |
| Echinacea pallida | Pale purple coneflower Pale coneflower | |
| Echinacea paradoxa | Yellow coneflower Yellow echinacea | |
| Echinacea purpurea | Eastern purple coneflower Purple coneflower | |
| Echinacea sanguinea | Sanguine purple coneflower | |
| Epilobium canum | Hummingbird trumpet California fuchsia Zauschneria | |
| Eriogonum abertianum | Abert's buckwheat Abert wild buckwheat | |
| Eriogonum acaule | Singlestem buckwheat | |
| Eriogonum annuum | Annual buckwheat Wild Buckwheat | |
| Eryngium aquaticum | Rattlesnake-master Rattlesnakemaster Snakeroot | |
| Eriogonum arborescens | Santa Cruz Island buckwheat Santa Cruz Island wild buckwheat | |
| Eriogonum caespitosum | Matted buckwheat | |
| Eriogonum compositum | Arrow-leaf wild buckwheat Arrowleaf buckwheat Northern buckwheat | |
| Eriogonum crocatum | Conejo buckwheat Saffron wild buckwheat | |
| Eriogonum davidsonii | Davidson's buckwheat | |
| Eriogonum desertorum | Great Basin Desert buckwheat Great Basin Desert wild buckwheat | |
| Eryngium diffusum | Spreading eryngo | |
| Eriogonum douglasii | Douglas' buckwheat | |
| Eriogonum fasciculatum | Eastern Mojave buckwheat Eastern mojave wild buckwheat California buckwheat | |
| Eriogonum fasciculatum var. polifolium | Eastern Mojave buckwheat | |
| Eriogonum flavum | Alpine golden buckwheat | |
| Eriogonum flavum var. piperi | Piper's golden buckwheat | |
| Eriogonum giganteum | St. Catherine's lace | |
| Eriogonum grande var. rubescens | Redflower buckwheat Red-flowered pacific island wild buckwheat | |
| Eriogonum heracleoides | Parsnipflower buckwheat | |
| Eryngium heterophyllum | Mexican thistle Wright's eryngo | |
| Eryngium hookeri | Hooker's eryngo | |
| Eriogonum inflatum | Desert trumpet Indian-pipeweed | |
| Eryngium integrifolium | Blueflower eryngo Blue-flower coyote-thistle | |
| Eriogonum jamesii | James' buckwheat James wild buckwheat | |
| Eriogonum kingii | Ruby Mountain buckwheat | |
| Eriophyllum lanatum | Common woolly sunflower Common woolly-sunflower Oregon sunshine | |
| Eryngium leavenworthii | Leavenworth's eryngo Eryngo | |
| Eriogonum longifolium | Longleaf buckwheat | |
| Eriogonum longifolium var. longifolium | Longleaf buckwheat | |
| Eriogonum multiflorum | Wild buckwheat Heartsepal buckwheat Heart-sepal wild buckwheat | |
| Ericameria nauseosa | Rubber rabbitbrush Gray Rabbitbrush | |
| Eriogonum nealleyi | Irion County buckwheat | |
| Eriogonum niveum | Snow buckwheat | |
| Eriogonum nudum | Naked buckwheat | |
| Eriogonum ovalifolium | Cushion buckwheat | |
| Eriogonum ovalifolium var. vineum | Cushenbury Buckwheat | |
| Eriogonum parishii | Mountainmist | |
| Erigeron philadelphicus | Philadelphia fleabane Fleabane daisy | |
| Eryngium prostratum | Eryngium | |
| Eriogonum racemosum | Red-root wild buckwheat Redroot buckwheat | |
| Eriogonum shockleyi | Shockley's buckwheat | |
| Eriogonum siskiyouense | Siskiyou buckwheat | |
| Eriogonum sphaerocephalum | Rock buckwheat | |
| Erigeron strigosus | Prairie fleabane Daisy fleabane | |
| Eriophyllum stoechadifolium | Seaside woolly sunflower | |
| Eriogonum tenellum var. ramosissimum | Tall buckwheat Granite Mountain wild buckwheat | |
| Eriogonum thymoides | Thymeleaf buckwheat | |
| Eriogonum umbellatum | Sulphur-flower buckwheat Sulphur-flower wild buckwheat Sulphur buckwheat Sulphur flower | |
| Eriogonum wrightii | Perennial buckwheat Wright buckwheat Wild buckwheat Bastard sage | |
| Eryngium yuccifolium | Button eryngo Button snakeroot Rattlesnake master Beargrass Bear's grass | |
| Eschscholzia caespitosa | Tufted poppy Tufted-poppy | |
| 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 minutiflora | Pygmy poppy | |
| Eupatorium altissimum | Tall thoroughwort Tall boneset | |
| Euthamia caroliniana | Slender goldentop | |
| Euthamia galetorum | Slender goldentop Narrowleaf fragrant goldenrod Narrow-leaf fragrant goldenrod | |
| Euthamia graminifolia | Flat-top goldentop Grass-leaved goldenrod | |
| Euthamia graminifolia var. graminifolia | Flat-top goldentop | |
| Euthamia gymnospermoides | Texas goldentop | |
| Euthamia leptocephala | Bushy goldentop Slender-headed euthamia | |
| Eupatoriadelphus maculatus | Joe-Pye Weed Spotted trumpetweed | |
| Eupatoriadelphus maculatus var. foliosum | Spotted joepyeweed | |
| Eupatoriadelphus maculatus var. maculatus | Spotted trumpetweed Spotted joe-pye-weed | |
| Eupatorium perfoliatum | Common boneset | |
| Eupatorium perfoliatum var. perfoliatum | Common boneset | |
| Eutrochium purpureum | Purple joepyeweed Sweet-scented joepyeweed Sweet joepyeweed | |
| Eupatorium rotundifolium | Roundleaf thoroughwort | |
| Eupatorium serotinum | Lateflowering thoroughwort White boneset Late boneset Late-flowering boneset | |
| Frangula californica | California buckthorn California Coffeeberry | |
| Frangula californica ssp. californica | California buckthorn Coffeeberry | |
| Fragaria virginiana | Virginia strawberry Wild strawberry | |
| Gaillardia aestivalis | Lanceleaf blanketflower Winkler gaillardia | |
| Gaillardia aestivalis var. aestivalis | Lanceleaf blanketflower Prairie gaillardia | |
| scientific name | common name(s) | image gallery |