1. Coming next after the twenty-first in position
   - twenty-second

See also: ordinal

Encyclopedia: 22nd

• genus Hymenophyllum
• genus Hynerpeton
• genus Hyoscyamus
• genus Hypentelium
• genus Hypericum
• genus Hyperoglyphe
• genus Hyperoodon
• genus Hyphantria
• genus Hypochaeris
• genus Hypochoeris
• genus Hypoderma
• genus Hypopachus
• genus Hypopitys
• genus Hypoxis
• genus Hypsiglena
• genus Hypsiprymnodon
• genus Hyracotherium
• genus Hyssopus
• genus Iberis
• genus Ibero-mesornis
• genus Ibis
• genus Ichthyosaurus
• genus Ichthyostega
• genus Ictalurus
• genus Icteria