1. A common rock-inhabiting fern of northern temperate regions having rusty-brown stipes and lanceolate pinnate fronds
   - rusty woodsia, fragrant woodsia, Woodsia ilvensis

Type of: woodsia

• 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
• genus Icterus
• genus Ictiobus
• genus Ictonyx
• genus Idesia
• genus Iguana
• genus Iguanodon
• genus Ilex
• genus Iliamna