Major items
| Organic | Scientific name | Common name | Part | Origin |
| Iberis amara L | Bitter Candytuft | seed | Europe | |
| bio | Ilex aquifolium L | Common Holly | leaf | SE-Europe |
| Ilex paraguariensis A St-Hil | Brazilian Tea | leaf | ||
| Illicium difengpi K I B et K I M | bark | China | ||
| Illicium verum Hookf | Star Anise | fruit | China | |
| Impatiens balsamina L | Garden Balsam | seed | China | |
| Impatiens capensis Meerb | Jewel Weed | N-America | ||
| Imperata cylindrica Beauv var major (Nees) CE | imperata | rhizome | China | |
| Indigofera arrecta Hochst ex A Rich | Bengal Indigo | aerial part | W-Africa | |
| Indigofera hirsuta L | Hairy Indigo | W-Africa | ||
| Indigofera tinctoria L | Indian indigo | |||
| Inga vera Willd | Ice cream bean | bark | C-America | |
| Inti bicallosa | Ecuador | |||
| Inula britannica L | British Elecampane | flower | China | |
| Inula helenium L / Inula racemosa Hook f | Elecampane | root | China | |
| Inula japonica Thunb (syn Inula britannica L) British Elecampane | flower | China | ||
| Inula racemosa HookF | S-Asia | |||
| Inula viscosa (L) Aiton (syn Dittrichia viscosa (L) | False Yellowhead | leaf | MidEast | |
| Ionopsis utricularioides | Ecuador | |||
| Iphigenia stellata Blatt | seed | Africa | ||
| Ipomoea digitata L | Finger Leaf Morning Glory | Indian Sub | ||
| Ipomoea nil (L) Roth | Blue Morning Glory | seed | China | |
| Ipomoea orizabensis (Pellet) Ledeb ex Steud Mexican scammony | root | C-America | ||
| Ipomoea pes-caprae (L) R Br | Beach Morning Glory | seed | Africa | |
| Ipomoea purga (Wender) Hayne | Veracruz Jalap | |||
| Ipomoea purpurea (L) Roth | Common Morning Glory | seed | China | |
| Iris × germanica L | European Iris | rhizome | SE-Europe | |
| Iris domestica Goldblatt & Mabb | Blackberry Lily | rhizome | China | |
| Iris pseudacorus L | Flag Iris | rhizome | E-Europe | |
| Iris ssp | Blue Flag | rhizome | N-America | |
| Iris versicolor L | Blue flag | N-America | ||
| Iris virginica L | Blue flag | N-America | ||
| Iris x germanica L nothovar florentina Dykes | Orris | flower | Indian Sub | |
| Irvingia gabonensis (Aubry-Lecomte ex O’Rorke) Baill | African Wild Mango | seed | W-Africa | |
| Isatis indigotica Fortune (syn Isatis tinctoria L) | Dyer's Woad (Black Henna) | root, leaf | China | |
| Isatis tinctoria L | Dyer's Woad (Black Henna)root, leaf | China | ||
| Islaya copiapoides | America | |||
| Islaya islayensis | America | |||
| Islaya longicarpa | America | |||
| Isochilus linearis | Ecuador | |||
| Isolatocereus dumortieri | America | |||
| Ixyophora aurantiaca | Ecuador |
