| Organic | Scientific name | Common name | Part | Origin |
| | Ecballium elaterium (L) A Rich | Squirting Cucumber | | SE-Europe |
| | Echinacea angustifolia DC | Narrow-leaf Purple Coneflower | root | N-America |
| | Echinacea pallida (Nutt) Nutt | Pale Purple Coneflower | herb | N-America |
| | Echinacea purpurea (L) Moench | Purple Coneflower | herb | N-America |
| | Echinocactus grusonii | Golden barrel cactus | | America |
| | Echinocactus horizonthalonius | Turk's head cactus | | America |
| | Echinocactus parryi | | | America |
| | Echinocereus coccineus | | | America |
| | Echinocereus dasyacanthus | | | America |
| | Echinocereus pectinatus | | | America |
| | Echinocereus pentalophus | | | America |
| | Echinocereus reichenbachii | Lace hedgehog cactus | | America |
| | Echinocereus rigidissimus | | | America |
| | Echinocereus roemeri(Echinocereus coccineus) | | | America |
| | Echinocereus stramineus | Strawberry hedgehog cactus | | America |
| | Echinocereus triglochidiatus | Kingcup cactus | | America |
| | Echinocereus viridiflorus | | | America |
| | Echinodorus grandiflorus (Cham & Schltdl) Micheli | | | S-America |
| | Echinodorus macrophyllus (Kunth) Micheli | | leaf | S-America |
| | Echinops giganteus ARich | | root | W-Africa |
| | Echinops spinosissimus Turra | | | |
| | Echinopsis adolfofriedrichii | | | America |
| | Echinopsis aurea | | | America |
| | Echinopsis cardenasiana | | | America |
| | Echinopsis crassicaulis | | | America |
| | Echinopsis leucantha | | | America |
| | Echinopsis minuana | | | America |
| | Echinopsis obrepanda | | | America |
| | Echinopsis rhodotricha | | | America |
| | Echinopsis semidenudata | | | America |
| | Echinopsis subdenudata | Easter lily cactus | | America |
| | Echinosepala shuarii | | | Ecuador |
| | Echium amoenum Fisch & Mey | Iranian Borago | flower | MidEast |
| | Ecklonia maxima (Osb) Papenfuss | Kelp | herb | S-Africa |
| | Eclipta alba (L) Hassk (syn Eclipta prostrata (L)False-daisy | False-daisy | | |
| | Eclipta prostrata (L) L | False-daisy | leaf, aerial part | C-America |
| | Elaeis guineensis | Oil Palm | seed & fruit | W-Africa |
| | Elaeodendron croceum (Thunb) DC | Forest saffron | | S-Africa |
| | Elettaria cardamomum (L) Maton | Cardamom | seed | C-America |
| | Eleutherococcus nodiflorus (Dunn) S Y Hu | | bark | China |
| | Eleutherococcus senticosus (Rupr & Maxim) Maxim | Siberian Ginger | rhizome | China |
| | Elleanthus ampliflorus | | | Ecuador |
| | Elleanthus blatteus | | | Ecuador |
| | Elleanthus blatteus pink | | | Ecuador |
| | Elleanthus capitatus | | | Ecuador |
| | Elleanthus graminifolius | | | Ecuador |
| | Elleanthus oliganthus | | | Ecuador |
| | Elymus repens (L) Gould subsp Repens | Couch grass | rhizome | |
| | Elytrigia repens (L) Desv ex Nevski (syn ElymusCouch grassGould subsp Repens) | Couch grass | rhizome | SE-Europe |
| | Elytropappus rhinocerotis (L f) Less | Rhinocerus Bush (Leaves) leaf | | S-Africa |
| | Embelia ribes Burm f | Vidanga | fruit | |
| | Emblica officinalis Gaertn (syn Phyllanthus emblica L) Gooseberry | Indian | | |
| | Emilia coccinea (Sims) G Don | Cupid's Paintbrush | | W-Africa |
| | Empetrum nigrum L | Black Crowberry | fruit | N-Europe |
| | Encyclia abbreviata | | | Ecuador |
| | Encyclia angustiloba 4n | | | Ecuador |
| | Encyclia argentinensis | | | Ecuador |
| | Encyclia bocourtii | | | Ecuador |
| | Encyclia bractescens | | | Ecuador |
| | Encyclia cordigera | | | Ecuador |
| | Encyclia dichroma | | | Ecuador |
| | Encyclia duveenii 4N | | | Ecuador |
| | Encyclia fowliei | | | Ecuador |
| | Encyclia ghillanyi | | | Ecuador |
| | Encyclia gracilis | | | Ecuador |
| | Encyclia granitica | | | Ecuador |
| | Encyclia hanburyi | | | Ecuador |
| | Encyclia mapuerae 000649 | | | Ecuador |
| | Encyclia mooreana | | | Ecuador |
| | Encyclia naranjapatensis | | | Ecuador |
| | Encyclia oncidioides | | | Ecuador |
| | Encyclia osmantha | | | Ecuador |
| | Encyclia patens | | | Ecuador |
| | Encyclia pauciflora | | | Ecuador |
| | Encyclia phoenicea | | | Ecuador |
| | Encyclia seidelii | | | Ecuador |
| | Encyclia tampensis | | | Ecuador |
| | Encyclia thienii | | | Ecuador |
| | Encyclia trachycarpa | | | Ecuador |
| | Encyclia unaensis | | | Ecuador |
| | Encyclia xerophytica | | | Ecuador |
| | Epidendrum agoyanense | | | Ecuador |
| | Epidendrum amethystinum | | | Ecuador |
| | Epidendrum ancistronum | | | Ecuador |
| | Epidendrum angustatum | | | Ecuador |
| | Epidendrum arachnoglossum | | | Ecuador |
| | Epidendrum atacazoicum | | | Ecuador |
| | Epidendrum bangii | | | Ecuador |
| | Epidendrum bracteolatum | | | Ecuador |
| | Epidendrum brevivenium | | | Ecuador |
| | Epidendrum calanthum | | | Ecuador |
| | Epidendrum capricornu | | | Ecuador |
| | Epidendrum centropetalum | | | Ecuador |
| | Epidendrum cochlidium | | | Ecuador |
| | Epidendrum compressum | | | Ecuador |
| | Epidendrum corymbosum | | | Ecuador |
| | Epidendrum coryophorum | | | Ecuador |
| | Epidendrum cristatum | | | Ecuador |
| | Epidendrum cupreum | | | Ecuador |
| | Epidendrum cylindrostachys | | | Ecuador |
| | Epidendrum densiflorum | | | Ecuador |
| | Epidendrum difforme 1 | | | Ecuador |
| | Epidendrum echinatum | | | Ecuador |
| | Epidendrum elegantissimum | | | Ecuador |
| | Epidendrum embreei | | | Ecuador |
| | Epidendrum englerianum alba | | | Ecuador |
| | Epidendrum englerianum pink | | | Ecuador |
| | Epidendrum excisum | | | Ecuador |
| | Epidendrum filamentosum | | | Ecuador |
| | Epidendrum freireanum | | | Ecuador |
| | Epidendrum gastropodium | | | Ecuador |
| | Epidendrum geminiflorum | | | Ecuador |
| | Epidendrum globiflorum | | | Ecuador |
| | Epidendrum goodspeedianum | | | Ecuador |
| | Epidendrum hemiscleria | | | Ecuador |
| | Epidendrum heterobracteatum | | | Ecuador |
| | Epidendrum hugomedinae | | | Ecuador |
| | Epidendrum hugomedinae type | | | Ecuador |
| | Epidendrum hymenodes | | | Ecuador |
| | Epidendrum ivanportillae | | | Ecuador |
| | Epidendrum jajense | | | Ecuador |
| | Epidendrum jaramilloae | | | Ecuador |
| | Epidendrum jatunsachanum | | | Ecuador |
| | Epidendrum kockii | | | Ecuador |
| | Epidendrum kymatochilum | | | Ecuador |
| | Epidendrum lacustre | | | Ecuador |
| | Epidendrum lehmannii | | | Ecuador |
| | Epidendrum macbridei | | | Ecuador |
| | Epidendrum macrocarpum | | | Ecuador |
| | Epidendrum macroophorum | | | Ecuador |
| | Epidendrum macrum | | | Ecuador |
| | Epidendrum mainauanum | | | Ecuador |
| | Epidendrum mancum dark | | | Ecuador |
| | Epidendrum medinae | | | Ecuador |
| | Epidendrum medusae | | | Ecuador |
| | Epidendrum melanoporphyreum | | | Ecuador |
| | Epidendrum microphyllum | | | Ecuador |
| | Epidendrum moronense | | | Ecuador |
| | Epidendrum musciferum | | | Ecuador |
| | Epidendrum nanegalense | | | Ecuador |
| | Epidendrum nanum | | | Ecuador |
| | Epidendrum neolehmannia | | | Ecuador |
| | Epidendrum neoporpax | | | Ecuador |
| | Epidendrum nocturnum | | | Ecuador |
| | Epidendrum oellgaardii | | | Ecuador |
| | Epidendrum oraion | | | Ecuador |
| | Epidendrum orbiculatum | | | Ecuador |
| | Epidendrum parkinsonianum | | | Ecuador |
| | Epidendrum parviflorum | | | Ecuador |
| | Epidendrum piliferum | | | Ecuador |
| | Epidendrum polyanthogastrium | | | Ecuador |
| | Epidendrum porphyreum | | | Ecuador |
| | Epidendrum porquerense | | | Ecuador |
| | Epidendrum portillae | | | Ecuador |
| | Epidendrum pteroglottis | | | Ecuador |
| | Epidendrum purum | | | Ecuador |
| | Epidendrum quitensium | | | Ecuador |
| | Epidendrum repens | | | Ecuador |
| | Epidendrum rhizomaniacum | | | Ecuador |
| | Epidendrum schumannianum | | | Ecuador |
| | Epidendrum schweinfurthianum | | | Ecuador |
| | Epidendrum sophronitoides | | | Ecuador |
| | Epidendrum suavis | | | Ecuador |
| | Epidendrum suinii | | | Ecuador |
| | Epidendrum summerhayesii | | | Ecuador |
| | Epidendrum tetraceros | | | Ecuador |
| | Epidendrum wallisii 4N | | | Ecuador |
| | Epidendrum zosterifolium | | | Ecuador |
| | Epiphyllum cartagense | | | America |
| | Epiphyllum darrahii | Fishbone cactus | | America |
| | Epiphyllum hookeri | Nightblooming cactus | | America |
| | Epiphyllum pittieri | | | America |
| | Epithelantha greggii | | | America |
| | Epithelantha micromeris | | | America |
| | Eria hyacinthodes | | | Ecuador |
| | Eriopsis biloba | | | Ecuador |
| | Eriopsis sceptrum | | | Ecuador |
| | Eriosyce spectabilis | | | America |
| | Erycina pusilla | | | Ecuador |
| | Escobaria aguirreana(Acharagma aguirreanum) | | | America |
| | Escobaria chaffeyi(Escobaria dasyacantha) | | | America |
| | Escobaria chihuahuensis | | | America |
| | Escobaria dasyacantha(Escobaria duncanii) | | | America |
| | Escobaria emskoetteriana | | | America |
| | Escobaria laredoi | | | America |
| | Escobaria leei | | | America |
| | Escobaria missouriensis(Coryphantha missouriensis) | Missouri foxtail | | America |
| | Escobaria muehlbaueriana | | | America |
| | Escobaria roseana | | | America |
| | Escobaria roseana(Acharagma roseanum) | | | America |
| | Escobaria sandbergii | | | America |
| | Escobaria strobiliformis(Escobaria chihuahuensis) | | | America |
| | Escobaria vivipara | spinystar, viviparous foxtail cactus, pincushion cactus, ball cactus | America |
| | Espostoa baumannii(Espostocactus baumannii) | | | America |
| | Espostoa nana(Espostoa melanostele) | | | America |
| | Espostoa ritteri(Borzicactus sericactus) | | | America |
| | Espostoopsis dybowskii | | | America |
| | Eulychnia castanea | mostruosa | | America |
| | Eulychnia taltalensis | | | America |
| | Euphorbia horrida | | | America |
| | Euphorbia lilacina | | | America |
| | Euphorbia pekinesis Rupr | Da ji | root | China |
| | Euphorbia poissonii Pax | | | W-Africa |
| | Euphorbia unispina NEBr | | | W-Africa |
| | Euphrasia officinalis L | Eyebright | | |
| | Euryale ferox Salisb | Euryale | seed | China |
| | Eurycoma longifolia Jack | | | SE Asia |
| | Eutrochium purpureum (L) E E Lamont var purpureum | Gravel | root | N-America |
| | Evernia prunastri (L) Acharius | Oak Moss | thallus | N-Africa |
| | Evodia rutaecarpa (Juss) Benth /Evodia rutaecarpa (Juss) Benth var officinalis (Dode) Huang | | fruit | China |
| | Evolvulus alsinoides (L) L | Dwarf Morning Glory | | |
| | Exogonium purga (Wender) Benth (syn IpomoeaVeracruz(Wender) Hayne) | Jalap purga | | |