1. By or like volcanoes
   "volcanically created landscape"

See also: volcanic

• genus Holocentrus
• genus Holothuria
• genus Homarus
• genus Homo
• genus Homogyne
• genus Homona
• genus Hordeum
• genus Horneophyton
• genus Hosta
• genus Hottonia
• genus Houttuynia
• genus Hovea
• genus Hoya
• genus Hudsonia
• genus Hugueninia
• genus Hulsea
• genus Humulus
• genus Hunnemania
• genus Hyacinthoides
• genus Hyacinthus
• genus Hyaena
• genus Hyalophora
• genus Hyalosperma
• genus Hybanthus
• genus Hydnocarpus