Complete list of species
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| scientific name | common name(s) | image gallery |
| Echinocereus russanthus | Brownspine Hedgehog Cactus Rusty Hedgehog Cactus Brownspine Hedgehog Rusty Hedgehog | |
| Echinocereus stramineus | Strawberry Hedgehog Cactus Pitaya | |
| Echinocereus triglochidiatus | Claret Cup Claret Cup Cactus Hedgehog Cactus Kingcup Cactus Mojave Mound Mohave Mound | |
| Echinocereus triglochidiatus var. triglochidiatus | Claret Cup Claret-cup Cactus Kingcup Cactus | |
| Echinocereus viridiflorus | Nylon Hedgehog Cactus Green Pitaya | |
| Echinocereus viridiflorus var. canus | Graybeard Hedgehog Cactus | |
| Echinocereus viridiflorus var. chloranthus | Nylon Hedgehog Cactus | |
| Echinocereus viridiflorus var. correllii | Correll's Hedgehog Cactus | |
| Echinocereus viridiflorus var. cylindricus | Green-flowered Hedgehog Cactus Green-flowered Hedgehog Nylon Hedgehog Cactus Nylon Hedgehog | |
| Echinocereus viridiflorus var. davisii | Davis' Hedgehog Cactus | |
| Echinocereus viridiflorus var. neocapillus | Weniger's Hedgehog Cactus | |
| Echinocereus viridiflorus var. russanthus | Russet Hedgehog Cactus Brown-flowered Cactus | |
| Echinocereus viridiflorus var. viridiflorus | Nylon Hedgehog Cactus | |
| Echinocereus viridiflorus var. weedinii | Weedin's Hedgehog Cactus | |
| Echinocereus ×roetteri | Lloyd's Hedgehog Cactus | |
| Echinocereus ×roetteri ×neomexicanus | Lloyd's Hedgehog Cactus | |
| Echinochloa crus-pavonis | Gulf Cockspur Grass Gulf Barnyard Grass Gulf Cock's-spur Grass | |
| Echinochloa crus-pavonis var. macera | Gulf Cockspur Grass | |
| Echinochloa muricata | American Barnyard Grass Rough Barnyard Grass Barnyard Grass American Cockspur Grass Wild Millet | |
| Echinochloa muricata var. microstachya | Rough Barnyard Grass Rough Barnyardgrass | |
| Echinochloa muricata var. muricata | Rough Barnyardgrass Rough Barnyard Grass | |
| Echinochloa oplismenoides | Chihuahuan Barnyard Grass Chihuahuan Cock's-spur Grass Chihuahuan Cockspur | |
| Echinochloa paludigena | Florida Barnyard Grass Florida Cock's-spur Grass Florida Cockspur Grass | |
| Echinochloa polystachya | Creeping River Grass | |
| Echinochloa walteri | Coast Cockspur Grass | |
| Echinocystis lobata | Wild Cucumber | |
| Echinodorus berteroi | Upright Burrhead | |
| Echinodorus cordifolius | Creeping Burhead Lance-leaf Burhead Radican Sword Burhead Creeping Water-plantain | |
| Echinodorus floridanus | Florida Burhead | |
| Echinodorus tenellus | Mudbabies | |
| Echinomastus erectocentrus | Redspine Fishhook Cactus Needle-spine Pineapple Cactus Sonora Pineapple Cactus | |
| Echinomastus gautii | Top Cactus | |
| Echinomastus intertextus | White Fishhook Cactus | |
| Echinomastus intertextus var. dasyacanthus | White Fishhook Cactus | |
| Echinomastus intertextus var. intertextus | White Fishhook Cactus | |
| Echinomastus johnsonii | Johnson's Fishhook Cactus | |
| Echinomastus mariposensis | Lloyd's Fishhook Cactus Mariposa Cactus | |
| Echinomastus warnockii | Warnock's Fishhook Cactus | |
| Echinopepon coulteri | Coulter's Balsam Apple Coulter’s Wild Balsam Apple | |
| Echinopepon wrightii | Wild Balsam Apple | |
| Echites umbellatus | Devil's Potato Rubber Vine | |
| Eclipta prostrata | Pie Plant False Daisy Eclipta | |
| Egletes viscosa | Erect Tropical Daisy Tropic Daisy | |
| Ehrendorferia chrysantha | Golden Eardrops Golden Ear-drops | |
| Ehrendorferia ochroleuca | White Bleeding Heart White Eardrops Yellow Bleeding Heart | |
| Ehretia anacua | Anacua Sugarberry Anacua Anaqua Anacahuita Knockaway Knackaway Sandpaper Tree Manzanita Manzanillo Tlalahuacate | |
| Elaeagnus commutata | Silverberry American Silverberry Wild Olive Wolf Willow | |
| Elaeocarpus bifidus | Kalia | |
| Elaphoglossum aemulum | Creeping Tongue Fern Creeping Tonguefern Ekaha Laukahi Nunui Opeha | |
| Elaphoglossum alatum | Ekaha Hoe a Maui Pihea Tall Tongue Fern Tall Tonguefern | |
| scientific name | common name(s) | image gallery |
