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Houstonia purpurea var. montana

Houstonia rosea

Houstonia wrightii

Houstonia caerulea

Quaker-ladies

Howellia aquatilis

Houttuynia cordata

Chameleon-plant

Houstonia longifolia

Longleaf summer bluet

Hudsonia montana

Houstonia canadensis

Hovenia dulcis

Japanese raisintree

Hulsea mexicana

Hulsea nana

Humulus lupulus var. lupulus

Huperzia × helleri

Huperzia serrata var. dentata

Lycopodium serratum var. dentatum

Lycopodium selago var. porophilum

Huperzia porophila

Hulsea algida

Hunnemannia fumariifolia

Goldencup