Holarrhena antidysenterica - Hypericum lloydii
- Holarrhena antidysenterica
- Holarrhena floribunda
- Holarrhena pubescens
- Holcus
- Holcus lanatus
- Holcus mollis
- Hollisteria
- Hollisteria lanata
- Holmgrenanthe
- Holmgrenanthe petrophila
- Holmskioldia
- Holmskioldia sanguinea
- Holocarpha
- Holocarpha heermannii
- Holocarpha macradenia
- Holocarpha obconica
- Holocarpha obconica ssp. autumnalis
- Holocarpha obconica ssp. obconica
- Holocarpha virgata
- Holocarpha virgata ssp. elongata
- Holocarpha virgata ssp. virgata
- Holodiscus
- Holodiscus discolor
- Holodiscus dumosus
- Holographis
- Holographis virgata
- Holosteum
- Holosteum umbellatum
- Holozonia
- Holozonia filipes
- Homalia
- Homalia trichomanoides
- Homaliadelphus
- Homaliadelphus sharpii
- Homalium
- Homalium racemosum
- Homalocladium
- Homalocladium platycladum
- Homalomena
- Homalomena rubescens
