| Ibiza | P. Z. - FANCY LEAVED |
| Icing Sugar | P. I. |
| Imperial Butterfly | P. ANGEL |
| Improved New Gypsy | P. REGAL |
| Inca Princess | P. REGAL |
| Inca Queen | P. REGAL |
| Indianapolis Pink | P. HYBRID IVY |
| Interlude | P. REGAL |
| Intrigue | P. REGAL |
| Iona Darling | P. REGAL |
| Iowata | P. Z. - FANCY LEAVED |
| Irene | P. Z. |
| Iris Hunt | P. Z. |
| Iris Mepham | P. Z. - FANCY LEAVED |
| Iris de la Salle | P. Z. |
| Irish Hunt | P. Z. |
| Irma | P. Z. |
| Isabel Elliott | P. Z. - MINIATURE |
| Isabel May | P. Z. - MINIATURE |
| Isadora | P. REGAL |
| Isadora | P. REGAL |
| Isidel | P. I. |
| Isle of Capri | P. REGAL |
| Isobel Eliot | P. Z. - DWARF |
| Italian Gem | P. I. |
| Ivan Wylie | P. REGAL |
| Ivory Snow | P. Z. - FANCY LEAVED |
| Ivy Leaf Lass O'Gowrie | P. Z. - FANCY LEAVED |