Incarvillea mairei (Lév.) Grierson
Incarvillea olgae Regel
Incarvillea zhongdianensis Grey-Wilson
Indigofera balfouriana Craib
Indigofera heterantha Wall. ex Brandis
Indigofera himalayensis Ali 'Silk Road'
Inula acaulis Schott & Kotschy ex Tchich. var. caulescens Náb.
Inula candida Cass.
Inula helenium L.
Inula macrocephala Boiss. & Kotschy
Inula magnifica Lipsky
Inula rhizocephala Schrenk ex Fisch. & C.A.Mey.
Ionactis alpina (Nutt.) Greene
Ipheion uniflorum (Graham) Raf.
Ipheion uniflorum (Graham) Raf. 'Alberta Castilla'
Ipheion uniflorum (Graham) Raf. 'Froyle Mill'
Ipheion uniflorum (Graham) Raf. 'Rolf Fieder'
Ipheion uniflorum (Graham) Raf. 'Whisley Blue'
Ipomoea leptophylla Torr.
Ipomopsis aggregata (Pursh) V. Grant
Ipomopsis macrosiphon (Kearney & Peebles) V.E.Grant & Wilken
Ipomopsis rubra (L.) Wherry
Ipomopsis tenuituba (Rydb.) V. Grant
Iris 'Frank Elder'
Iris 'Gingerbread Man'
Iris 'Golden Ruby'
Iris 'Hey There'
Iris 'Killarney Green'
Iris 'Three Cherries'
Iris 'Warlsind'

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