Not Established
| Common name (English) | |
|---|---|
| Gazania rigens | |
| Gossypium barbadense | American Pima cotton; Sea Island cotton |
| Gossypium herbaceum | Arabian cotton |
| Gossypium hirsutum | American cotton |
| Grevillea robusta | |
| Helianthus annuus | Sunflower |
| Helianthus tuberosus | Jerusalem articoke |
| Hemarthria altissima | |
| Hibiscus rosa-sinensis | China rose, Shoe flower, Chinese hibiscus |
| Hippocampus kuda | Spotted seahorse, Common seahorse |
| Hyacinthus orientalis | Garden Hyacinth |
| Hylocereus undatus | |
| Hypoponera punctatissima | |
| Hyssopus officinalis | Hyssop |
| Ilex aquifolium | English holly |
| Indothais lacera | |
| Ipomoea indica | Blue dawn flower |
| Ipomoea purpurea | Common morning-glory |
| Jacaranda mimosifolia | Black poui |
| Jacobaea maritima maritima |