1. Having several forms of gametoecia on the same plant
   - heteroicous, polygamous

See also: monecious, monoecious, monoicous

• family Hydrocharitaceae
• family Hydrochoeridae
• family Hydrophidae
• family Hydrophyllaceae
• family Hygrophoraceae
• family Hylidae
• family Hylobatidae
• family Hymenophyllaceae
• family Hypericaceae
• family Hyperodontidae
• family Hypocreaceae
• family Hypodermatidae
• family Hypoxidaceae
• family Hystricidae
• family Ibidiidae
• family Ichneumonidae
• family Ichthyosauridae
• family Icteridae
• family Iguania
• family Iguanidae
• family Iguanodontidae
• family Indicatoridae
• family Indriidae
• family Ipidae
• family Irenidae