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Genus Helianthus
- genus of tall erect or branched American annual or perennial herbs with showy flowers: sunflowers
Genus Helichrysum
- large genus of mostly African and Australian herbs and shrubs: everlasting flowers; in some classifications includes genus Ozothamnus
Genus Helipterum
- genus of South African and Australian herbs or shrubs grown as everlastings; the various Helipterum species are currently in process of being assigned to other genera especially Pteropogon and Hyalosperma
Genus Heterotheca
- genus of yellow-flowered North American herbs
Genus Hieracium
- large genus of perennial hairy herbs of Europe to western Asia to northwestern Africa and North America; few are ornamental; often considered congeneric with Pilosella
Genus Homogyne
- small genus of low perennial herbs of montane Europe; in some classifications included in genus Tussilago
Genus Hulsea
- small genus of erect balsam-scented herbs; Pacific coast of the northwestern United States
Genus Hyalosperma
- genus of herbs of temperate Australia including some from genus Helipterum
Genus Hypochaeris
- widely distributed genus of herbs with milky juice; includes some cosmopolitan weeds