Hakea

Hakonechloa

Halesia

Hamamelis

Hebe

Hedera

Hedychium

Helenium

Helianthemum

Helianthus

Helichrysum

Helictotrichon

Heliopsis

Helleborus

Helwingia

Hemerocallis

Hepatica

Heptacodium

Heracleum

Herniaria

Hertia

Hesperis

Heterotheca

Heuchera

Heucherella

Hibiscus

Hieracium

Hippophae

Hoheria

Holboellia

Holcus

Holodiscus

Hosta

Houstonia

Houttuynia

Hovenia

Humulus

Hutchinsia

Hyacinthoides

Hydrangea

Hymenocallis

Hypericum

Hypsela

Hyssopus