| Scientific Name | Common Name(s) | Life History | Growth Form | |
|---|---|---|---|---|
|
Ilex aquifolium | English holly, European holly, Oregon holly, common holly, holly | Perennial | tree |
| Ilex cornuta 'Burfordii' | Burford Holly | Perennial | tree | |
| Ilex cornuta 'Needlepoint' | Needlepoint Holly | Perennial | shrub | |
| Impatiens balfourii | Kashmir balsam | |||
| Impatiens glandulifera | Himalayan balsam, ornamental jewelweed, Indian balsam, policeman's-helmet | |||
| Imperata cylindrica (L.) Raeusch. | Cogongrass, speargrass | Perennial | grass | |
| Ipomoea batatas | sweet potato | Annual | vine | |
|
Ipomoea indica | blue morningglory, blue dawn-flower, blue morning-glory, common morning-glory, morning-glory, ocean-blue morning-glory, perennial morning-glory, purple morning-glory, purple-flower bellvine, purple-flower morning-glory, tall morning-glory, blue dawnflower, oceanblue morning-glory, dunny creeper | Perennial | vine |
| Iris foetidissima L. | Stinking iris, Gladwin iris, coral iris | Perennial | forb | |
|
Iris orientalis | yellowband iris, Oriental iris, Turkish iris | Perennial | forb |
|
Iris pseudacorus | pale yellow iris | Perennial | forb |
|
Jacaranda mimosifolia | black poui , jacaranda | Perennial | tree |
|
Kniphofia uvaria | redhot poker, pokerplant, torchflower, torch-lily | Perennial | forb |
|
Koelreuteria paniculata | Goldenrain tree, Pride-of-India, Varnish tree | Perennial | tree |
|
Lagerstroemia indica | crapemyrtle | Perennial | shrub |
| Lagerstroemia indica 'Natchez' | Natchez Crape Myrtle | Perennial | tree | |
|
Lamiastrum galeobdolon | yellow archangel | Perennial | forb |
|
Lamium maculatum | Spotted deadnettle | Perennial | forb |
| Lamium maculatum 'Beacon Silver' | Deadnettle | |||
|
Lantana camara | lantana, common lantana, wild sage | Perennial | shrub |
|
Lathyrus latifolius | Perennial sweet pea | Perennial | forb |
|
Lathyrus nissolia | grass vetchling, grassy vetch, grass pea | Annual | forb |
| Lathyrus tingitanus | Tangier pea | |||
|
Leonotis nepetifolia | klip dagga, Christmas candlestick, lion's ear | Perennial | shrub |
|
Leptospermum laevigatum | Australian teatree, Australian myrtle | Perennial | shrub |