1. One year of age

See also: immature, young

• genus Hexalectris
• genus Hexamita
• genus Hexanchus
• genus Hibbertia
• genus Hibiscus
• genus Hieracium
• genus Himantoglossum
• genus Himantopus
• genus Hippeastrum
• genus Hippobosca
• genus Hippocampus
• genus Hippocrepis
• genus Hippodamia
• genus Hippoglossoides
• genus Hippoglossus
• genus Hippopotamus
• genus Hipposideros
• genus Hippotragus
• genus Hipsurus
• genus Hirudo
• genus Hirundo
• genus Hoheria
• genus Holarrhena
• genus Holbrookia
• genus Holcus