| Genus | |
|---|---|
| Iacovielloara auct. | |
| Ianara M.Clark | |
| Ianclarkara J.M.H.Shaw | |
| Ichijoara J.M.H.Shaw | |
| Ilonara J.M.H.Shaw | |
| Imerinaea Schltr. | |
| Ingeara | |
| Ingramara J.M.H.Shaw | |
| Ionettia auct. | |
| Ionmesa J.M.H.Shaw | |
| Ionmesettia J.M.H.Shaw | |
| Ionocentrum J.M.H.Shaw | |
| Ionocidium auct. | |
| Ionomesidium | |
| Ionopsis Kunth | |
| Ionparettichilum J.M.H.Shaw | |
| Ionumnia J.M.H.Shaw | |
| Ipsea Lindl. | |
| Ipseglottis P.C.S.Kumar & C.S.Kumar | |
| Irvingara auct. | |
| Isabelia Barb.Rodr. | |
| Isadendrum J.M.H.Shaw | |
| Isaoara auct. | |
| Ischnogyne Schltr. | |
| Isochilus R.Br. | |
| Isotria Raf. | |
| Iwanagara auct. | |
| Ixyophora Dressler | |
| Izumiara auct. |