| Latin Name | Common Name | Family | Synonyms | Edibility Rating | Medicinal Rating |
| Afzelia africana | African Mahogany | Fabaceae | Intsia africana (Sm. ex Pers.) Kuntze Pahudia africana (Sm. ex Pers.) Prain | 2 | 2 |
| Belamcanda chinensis | Leopard Lily, Blackberry lily, Leopard Flower | Iridaceae | Iris chinensis. Ixia chinensis. | 1 | 3 |
| Dittrichia viscosa | False yellowhead | Asteraceae or Compositae | Inula viscosa. (L.)Ait. | 0 | 0 |
| Gynandriris sisyrinchium | Spanish Nut | Iridaceae | Iris sisyrinchium. | 1 | 0 |
| Iberis amara | Rocket Candytuft, Annual candytuft | Brassicaceae or Cruciferae | | 1 | 2 |
| Iberis umbellata | Candytuft, Globe candytuft | Brassicaceae or Cruciferae | | 0 | 0 |
| Idesia polycarpa | Idesia | Flacourtiaceae | Polycarpa maximowiczii. | 1 | 0 |
| Ilex aculeolata | | Aquifoliaceae | | 1 | 0 |
| Ilex aquifolium | Holly, English holl, Christmas Holly, Common Holly, English Holly | Aquifoliaceae | Aquifolium croceum. Aquifolium heterophyllum. Aquifolium ilex. Ilex balearica | 2 | 2 |
| Ilex asprella | | Aquifoliaceae | | 0 | 2 |
| Ilex cassine | Cassine, Dahoon, Cassine Holly | Aquifoliaceae | I. caroliniana. | 1 | 1 |
| Ilex chapaensis | | Aquifoliaceae | | 1 | 0 |
| Ilex coriacea | Large Gallberry | Aquifoliaceae | | 1 | 0 |
| Ilex cornuta | Horned Holly, Chinese holly | Aquifoliaceae | | 1 | 2 |
| Ilex crenata | Japanese Holly, Box Leaved Holly | Aquifoliaceae | | 1 | 0 |
| Ilex glabra | Inkberry | Aquifoliaceae | Prinos glaber. | 1 | 0 |
| Ilex integra | Mochi Tree | Aquifoliaceae | Othera japonica. | 1 | 0 |
| Ilex latifolia | Tarajo | Aquifoliaceae | | 1 | 0 |
| Ilex macropoda | | Aquifoliaceae | | 1 | 0 |
| Ilex opaca | American Holly | Aquifoliaceae | I. quercifolia. Meerb. | 2 | 2 |
| Ilex pedunculosa | | Aquifoliaceae | | 1 | 1 |
| Ilex pubescens | | Aquifoliaceae | | 0 | 2 |
| Ilex purpurea | | Aquifoliaceae | I. chinensis. Sims. | 0 | 2 |
| Ilex rotunda | Kurogane holly | Aquifoliaceae | | 0 | 1 |
| Ilex verticillata | Winterberry, Common winterberry | Aquifoliaceae | Prinos verticillata. | 1 | 3 |
| Ilex vomitoria | Yaupon Holly, | Aquifoliaceae | | 1 | 1 |
| Ilex x altaclerensis | Holly | Aquifoliaceae | | 0 | 0 |
| Ilex yunnanensis | | Aquifoliaceae | | 0 | 1 |
| Illicium anisatum | Star Anise, Chinese Anise,Japanese Anise | Illiciaceae | I. religiosum. Sieb.&Zucc. | 1 | 2 |
| Illicium floridanum | Aniseed Tree, Florida anisetree, Purple Anise, Star Anise, Florida anise | Illiciaceae | | 1 | 0 |
| Illicium verum | Ba Jiao Hui Xian, Staranise tree | Illiciaceae | | 3 | 3 |
| Impatiens aurella | Paleyellow touch-me-not | Balsaminaceae | | 2 | 2 |
| Impatiens balsamina | Rose Balsam, Spotted snapweed, Touch-Me-Not, Garden Balsam | Balsaminaceae | | 2 | 2 |
| Impatiens capensis | Jewelweed | Balsaminaceae | I. biflora. I. fulva. | 3 | 2 |
| Impatiens ecalcarata | | Balsaminaceae | | 2 | 2 |
| Impatiens edgeworthii | | Balsaminaceae | | 0 | 0 |
| Impatiens glandulifera | Jewelweed, Ornamental jewelweed | Balsaminaceae | I. roylei. | 3 | 1 |
| Impatiens noli-tangere | Touch-Me-Not | Balsaminaceae | | 3 | 2 |
| Impatiens occidentalis | | Balsaminaceae | | 3 | 2 |
| Impatiens pallida | Pale Jewelweed, Pale touch-me-not | Balsaminaceae | | 3 | 3 |
| Impatiens parviflora | Smallflower touchmenot | Balsaminaceae | | 2 | 2 |
| Impatiens sulcata | | Balsaminaceae | I. gigantea. Edgew. | 2 | 0 |
| Impatiens textori | | Balsaminaceae | | 1 | 0 |
| Impatiens tingens | | Balsaminaceae | | 1 | 0 |
| Imperata cylindrica | Cogongrass, Japanese Blood Grass | Poaceae or Gramineae | I. arundinacea. Miscanthus arundinacea. Saccharum cylindricum. | 3 | 3 |
| Incarvillea delavayi | Hardy Gloxinia | Bignoniaceae | | 1 | 0 |
| Incarvillea sinensis | | Bignoniaceae | | 1 | 1 |
| Indigofera arrecta | Bengal Indigo, Java indigo, Natal indigo | Fabaceae | Indigofera kisantuensis De Wild. & T.Durand Indigofera scopa De Wild. & T.Durand Indigofera tinctori | 2 | 2 |
| Indigofera cassioides | | Fabaceae or Leguminosae | I. pulchella. Roxb. | 1 | 1 |
| Indigofera decora | Chinese indigo | Fabaceae or Leguminosae | I. incarnata. Hedysarum incanum. Thunb. 1784. - this does not relate to I. incanum. Hedysarum incarn | 2 | 1 |
| Indigofera hebepetala | | Fabaceae or Leguminosae | | 1 | 0 |
| Indigofera hendecaphylla | Creeping indigo, spicate indigo, trailing indigo | Fabaceae | Indigofera anceps Vahl ex Poir. Indigofera bolusii N.E.Br. Indigofera endecaphylla Jacq. Indigofera | 0 | 0 |
| Indigofera heterantha | Indigo Bush | Fabaceae or Leguminosae | I. dosva. Lindl. non D.Don. I. gerardiana. Baker. I. rubroviolacea. | 1 | 0 |
| Indigofera kirilowii | Kirilow's indigo, Indigo | Fabaceae or Leguminosae | I. macrostachya. Bunge. non Vent. I. koreana. Ohwi. | 0 | 1 |
| Indigofera pseudotinctoria | Indigo | Fabaceae or Leguminosae | | 1 | 0 |
| Indigofera suffruticosa | Anil Indigo, Anil de pasto | Fabaceae | Indigofera anil L. | 0 | 2 |
| Indigofera tinctoria | Indigo, True Indigo, dye indigo | Fabaceae | Anila tinctoria normalis Kuntze Indigofera anil orthocarpa DC. Indigofera bergii Vatke Indigofera ci | 2 | 2 |
| Indocalamus latifolius | | Poaceae or Gramineae | | 0 | 0 |
| Inga cinnamomea | Inga Assu, Inga Acu | Fabaceae | Feuilleea cinnamomea (Spruce ex Benth.) Kuntze | 4 | 0 |
| Inga densiflora | Densely flowered Inga | Fabaceae | Inga heinei Harms Inga java Pittier Inga langlassei Pittier Inga limonensis Pittier Inga microdonta | 4 | 0 |
| Inga edulis | Ice Cream Bean, Monkey Tamarind | Fabaceae | Feuilleea conferta (Benth.) Kuntze Feuilleea edulis (Mart.) Kuntze Feuilleea scabriuscula (Benth.) K | 4 | 2 |
| Inga insignis | Guaba de zorro | Fabaceae | Feuilleea insignis (Kunth) Kuntze | 4 | 0 |
| Inga jinicuil | Ice Cream Bean, Jinicuil | Fabaceae | Feuilleea jinicuil (Cham. & Schltdl.) Kuntze | 4 | 0 |
| Inocarpus fagifer | Tahiti Chestnut, Polynesian Chestnut | Fabaceae | Aniotum fagiferum Parkinson Bocoa edulis (J.R.Forst. & G.Forst.) Baill. Cajanus edulis (J.R.Forst. & | 4 | 2 |
| Intsia bijuga | Moluccan Ironwood, Ipil | Fabaceae | Afzelia bijuga (Colebr.) A.Gray-Verdcourt. Albizia bijuga A.Gray Eperua decandra Blanco Intsia amboi | 1 | 2 |
| Intsia palembanica | Borneo Teak, Merbau | Fabaceae | Afzelia bakeri Prain Afzelia palembanica (Miq.) Baker Intsia bakeri (Prain) Prain Intsia plurijuga H | 1 | 1 |
| Inula britannica | Xuan Fu Hua, British yellowhead | Asteraceae or Compositae | | 0 | 3 |
| Inula britannica chinensis | Xuan Fu Hua | Asteraceae or Compositae | | 1 | 3 |
| Inula cappa | Sheep's Ear | Asteraceae or Compositae | | 0 | 2 |
| Inula conyza | Ploughman's Spikenard | Asteraceae or Compositae | I. squarrosa. non L. Conyza squarrosa. | 0 | 1 |
| Inula crithmoides | Golden Samphire | Asteraceae or Compositae | | 2 | 0 |
| Inula helenium | Elecampane, Elecampane inula | Asteraceae or Compositae | Aster helenium. Aster officinalis. Corvisartia helenium. Helenium grandiflorum. | 3 | 3 |
| Inula racemosa | | Asteraceae or Compositae | | 0 | 2 |
| Inula royleana | | Asteraceae or Compositae | | 0 | 1 |
| Ipomoea alba | Moonflower, Tropical white morning-glory | Convolvulaceae | Calonyction aculeatum. C. album. | 2 | 1 |
| Ipomoea aquatica | Swamp Morning Glory | Convolvulaceae | Ipomoea reptans Poir. | 4 | 2 |
| Ipomoea batatas | Sweet Potato, Black Sweet Potato, Sweet Potato Vine | Convolvulaceae | | 5 | 0 |
| Ipomoea jalapa | Jalap | Convolvulaceae | I. purga. | 0 | 3 |
| Ipomoea leptophylla | Bush Moon Flower | Convolvulaceae | | 3 | 2 |
| Ipomoea nil | Japanese Morning Glory, Whiteedge morning-glory | Convolvulaceae | Pharbitis nil | 0 | 2 |
| Ipomoea pandurata | Wild Potato Vine, Man of the earth | Convolvulaceae | Convulvulus candicans. C. panduratus. | 3 | 2 |
| Ipomoea purpurea | Common Morning Glory, Tall morning-glory | Convolvulaceae | Pharbitis purpurea. | 0 | 2 |
| Ipomoea sagittata | Saltmarsh Morning Glory, Saltmarsh morning-glory | Convolvulaceae | | 0 | 1 |
| Ipomoea tricolor | Morning Glory, Grannyvine | Convolvulaceae | I. rubrocaerulea. Pharbitis rubrocaerulea. P. tricolor. | 0 | 1 |
| Ipomopsis aggregata | Skyrocket, Scarlet gilia | Polemoniaceae | Gilia aggregata. (Pursh.)Spreng. | 1 | 2 |
| Ipomopsis congesta | Ballhead ipomopsis | Polemoniaceae | Gilia congesta | 0 | 1 |
| Iris cristata | Crested Iris, Dwarf crested iris | Iridaceae | | 1 | 1 |
| Iris decora | | Iridaceae | I. nepalensis. D.Don. | 0 | 1 |
| Iris douglasiana | Mountain Iris, Douglas iris | Iridaceae | I. beecheyana. I. watsoniana. | 0 | 0 |
| Iris ensata | Japanese Water Iris | Iridaceae | I. kaempferi. I. lactea. | 1 | 1 |
| Iris filifolia | | Iridaceae | I. juncea. | 1 | 0 |
| Iris foetidissima | Stinking Gladwin, Stinking iris, Gladwin Iris | Iridaceae | | 0 | 2 |
| Iris germanica | Purple Flag, German iris, Orris-root, Tall Bearded German Iris, Bearded Iris | Iridaceae | | 1 | 3 |
| Iris germanica florentina | Orris, Orris-root | Iridaceae | I. florentina. L. | 1 | 3 |
| Iris japonica | | Iridaceae | | 1 | 2 |
| Iris kemaonensis | | Iridaceae | | 0 | 2 |
| Iris macrosiphon | Bowltube Iris | Iridaceae | I. amabilis. I. californica. I. elata. | 0 | 1 |
| Iris missouriensis | Rocky Mountain Iris | Iridaceae | | 1 | 2 |
| Iris pallida | Dalmation Iris, Sweet iris, Fragrant Iris, Zebra Iris | Iridaceae | | 2 | 1 |
| Iris pseudacorus | Yellow Flag, Paleyellow iris | Iridaceae | | 1 | 2 |
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