| I |
| Iberis amara; I. umbellata, Candytuft (annual) |
|
Iberis sempervirens, Candytuft |
| Iberis sempervirens, Evergreen candytuft |
| Iberis sempervirens, Evergreen candytuft |
| Ilex 'Dragon Lady', Dragon Lady holly |
| Ilex 'Nellie R. Stevens', Nellie Stevens holly |
| Ilex 'Red Hollies', Red hybrid hollies |
| Ilex aquifolium, English holly |
| Ilex cassine, Myrtle leaved holly; Dahoon holly |
| Ilex cornuta 'Burfordii', Burford holly |
| Ilex cornuta 'Carissa', Carissa holly |
| Ilex cornuta 'D'Or', D'Or Chinese holly |
| Ilex cornuta 'O'Spring', O'Spring Chinese holly |
| Ilex cornuta 'Rotunda', Dwarf horned holly |
| Ilex cornuta D' Or, D' Or Chinese holly |
| Ilex cornuta, Chinese holly |
| Ilex cornuta, Chinese holly |
| Ilex crenata 'Convexa', Convexa Japanese holly |
| Ilex crenata 'Helleri', Helleri Japanese holly |
| Ilex crenata 'Hetzii', Hetz's Japanese holly |
| Ilex crenata, Japanese holly |
| Ilex decidua 'Sundance', Sundance holly |
| Ilex decidua, Possumhaw |
| Ilex glabra, Inkberry |
| Ilex hybrids, Decidious holly |
| Ilex latifolia, Lusterleaf holly |
| Ilex latifolia, Lusterleaf holly |
| Ilex montana, Mountain holly |
| Ilex opaca 'Claredon Spreading', Claredon Spreading American holly |
| Ilex opaca 'Maryland Dwarf', Maryland Dwarf American holly |
| Ilex opaca, American holly |
| Ilex pedunculosa, Longstalk holly |
| Ilex pernyi, Perny holly |
| Ilex purpurea, Purple holly |
| Ilex serrata, Finetooth holly |
| Ilex verticillata x I. serata hybrids, Winterberry |
| Ilex verticillata, Winterberry holly; Black alder |
| Ilex verticillata, Winterberry; Black alder |
| Ilex vomitoria 'Bordeaux'; I. vomitoria 'Condeaux', Bordeaux yaupon holly |
| Ilex vomitoria 'Nana', Dwarf yaupon |
| Ilex vomitoria 'Stokes Dwarf', Stokes Dwarf yaupon holly |
| Ilex vomitoria 'Will Fleming', Will Fleming holly |
| Ilex vomitoria 'Will Fleming', Will Fleming yaupon holly |
| Ilex vomitoria f. pendula, Weeping yaupon holly |
| Ilex vomitoria, Yaupon holly |
| Ilex x 'Carolina Sentinel', Carolina Sentinel holly |
| Ilex x 'Emily Brumer', Emily Brumer holly |
| Ilex x 'Emily Brumer', Emily Brumer holly |
| Ilex x 'Martha Berry', Martha Berry holly |
| Ilex x 'Martha Berry', Martha Berry holly |
| Ilex x 'Nellie R. Stevens', Nellie R. Stevens Holly |
| Ilex x 'Savannah', Savannah holly |
| Ilex x 'Scepter', Scepter holly |
| Ilex< x attenuata 'Fosteri', Foster's Holly |
| Ilex x meserveae, Meserve hybrid hollies |
| Illicium anisatum, Japanese anisetree |
| Illicum flordanum, Florida anisetree |
| Illicum floridanum, Florida anisetree |
| Illicum henryi, Henry anisetree |
| Illicum parviflorum, Small anisetree |
| Impatiens 'New Guinea', New guinea impatiens |
| Impatiens balsamina, Balsam |
| Impatiens capensis, Jewel weed; Touch-me-not |
| Impatiens spp., Jewel weed; Touch-me-not |
| Impatiens wallerana, Impatiens |
| Imperarata cylindrica ruba, Japanese blood grass |
| Imperata cylindrica var. koenigii, Japanese blood grass |
| Incarvillea delavyi, Hardy gloxinia |
| Indigofera amblyantha, Indigofera |
| Indigofera decora, Chinese indigo |
| Indigofera heterantha, Himalayan indigo |
| Indigofera kirilowii, Kirilow indigo |
| Indigofera pseudotinctoria, Indigofera |
| Inula helenium, Elecampane |
|
Ipheion uniflorum; Triteleia unflora, Spring Starflower |
| Ipomea alba; Calonyction aculeatum, Moonflower; Moonvine |
| Ipomea batatas, Water spinach |
| Ipomea purpurea; I. nil, Morning glory |
| Ipomea quamoclit; Quamoclit pennata, Cypress vine |
| Ipomoea lobata; Mina lobata, Firecracker vine; Spanish flag |
| Ipomoea pandurata, Wild potato vine |
| Ipomoea spp., Morning glory; Cypress vine |
| Ipomoea tricolor, Morning glory |
| Ipomoea x batatus, Sweet potato vine |
| Ipomoea x multifida, Cardinal climber; Hearts and honey vine |
| Ipomopsis rubra, Standing cypress |
| Ipomopsis rubra, Standing cypress; Scarlet gilia |
| Iris brevicaulis, Lamance iris; Short-stemmed iris |
| Iris cristata alba, White crested dwarf iris |
| Iris cristata, Crested dwarf iris |
|
Iris cristata, Iris |
| Iris ensata; I. kaempferi, Japanese water iris |
| Iris germanica, Rhizomatous iris; Bearded iris; German iris |
| Iris hexagona, Dixie iris |
|
Iris hollandica, Dutch Iris |
|
Iris reticulata 'Harmony', Dwarf iris; Species iris |
|
Iris reticulata; I. danfordiae; I. histroides, Dwarf iris; Species iris |
| Iris spp., Dwarf iris; Crested dwarf iris |
|
Iris tectorum, Japanese roof iris |
| Iris tectorum, Roof iris; Wall iris |
| Iris versicolor, Larger blue flag iris |
| Iris virginica, Southern blue flag iris |
| Iris virginica, Southern blue flag iris |
| Iris xiphiodes; I. angelica; I. latifolia, English iris |
| Isotria verticillata, Large whorled pogonia |
| Itea chinensis, Chinese sweetspire |
| Itea virginica, Virginia sweet spire; Itea; Virginia willow |
| Itea virginica, Virginia sweetspire; Itea; Virginia willow |
| Ixia, African Corn-Lily; Wand flower |
| Ixiolirion montanum (I. pallasii), Blue Altai lily; Siberian lily; Sky Blue lily |
| Ixora coccinea, Ixora; Flame of the woods; Jungle flame |