Families (As per APG III)

 
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

I

Icacinaceae - 14 (Apodytes dimidiata var. acutifolia, Gomphandra andamanica, Gomphandra comosa, Gomphandra coriacea, Gomphandra tetrandra, Iodes hookeriana, Iodes ovalis, Miquelia dentata, Miquelia kleinii, Natsiatum herpeticum, Nothapodytes nimmoniana, Platea latifolia, Pyrenacantha volubilis, Sarcostigma kleinii)

Iridaceae - 35 (Aristea ecklonii, Babiana stricta, Babiana villosa, Belamcanda chinensis, Crocosmia crocosmiiflora, Crocosmia pottsii, Crocus sativus, Dierama pulcherrimum, Eleutherine bulbosa, Eleutherine palmifolia, Freesia refracta, Gladiolus callianthus, Gladiolus dalenii, Gladiolus natalensis, Gladiolus primulinus, Gladiolus × gandavensis, Iris clarkei, Iris decora, Iris duthiei, Iris germanica, Iris goniocarpa, Iris japonica, Iris kumaonensis, Iris milesii, Iris spuria, Iris tectorum, Iris unguicularis, Moraea bicolor, Moraea iridioides, Neomarica caerulea, Neomarica gracilis, Neomarica northiana, Sisyrinchium rosulatum, Watsonia rosea, Weihea zeylanica)

Iteaceae - 8 (Itea chinensis, Itea nutans, Ribes alpestre, Ribes glaciale, Ribes griffithii, Ribes himalense, Ribes orientale, Ribes takare)