| Halleria lucida | Halleria abyssinica | 
| Hamelia patens | Hamelia coccinea, Hamelia erecta, Hamelia grandiflora, Hamelia sphaerocarpa | 
| Hibiscus acetosella | Hibiscus eetveldianus | 
| Hibiscus aculeatus | Hibiscus scaber | 
| Hibiscus aethiopicus var. aethiopicus | Hibiscus ellipticus, Hibiscus aethiopicus var. genuinus, Hibiscus propinquus, Hibiscus ambelacensis, Hibiscus luteiflorus, Hibiscus aethiopicus var. helvolus | 
| Hibiscus calyphyllus | Hibiscus calycinus | 
| Hibiscus cisplatinus | Hibiscus striatus | 
| Hibiscus coccineus | Hibiscus semilobatus, Hibiscus carolinianus, Hibiscus integrifolius, Hibiscus speciosus | 
| Hibiscus engleri | Hibiscus cordatus, Hibiscus irritans, Hibiscus microcylicinus, | 
| Hibiscus ferrugineus | Hibiscus crassinervius, Hibiscus shirensis, Hibiscus shirensis var. perrierellus | 
| Hibiscus lasiocarpus | Hibiscus californicus, Hibiscus moscheutos ssp. lasiocarpos, Hibiscus moscheutos ssp. lasiocarpus, Hibiscus moscheutos var. occidentalis | 
| Hibiscus martianus | Hibiscus cardiophyllus | 
| Hibiscus micranthus | Hibiscus micranthus var. micranthus, Hibiscus gossypinus | 
| Hibiscus splendens | Abelmoschus splendens | 
| Hibiscus tiliaceus | Hibiscus elatus | 
| Hovea elliptica | Hovea celsii | 
| Hovenia dulcis | Hovenia acerba, Hovenia inequalis | 
| Huernia hystrix | Stapelia hystrix |