1. California herb with brownish-purple or greenish bell-shaped flowers
   - brown bells, Fritillaria micrantha

Type of: checkered lily [US], fritillary

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