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Hieracium ×fassettii var. fassettii

Hieracium ×fassettii var. mendicum

Hieracium ×fassettii var. wisconsinense

Hieracium robinsonii

Hieracium parryi

Hieracium scribneri

Hierochloe hirta subsp. hirta

Amaryllis striatum

Amaryllis vittatum

Hibiscus vitifolius

Tropical rose mallow

Hibiscus waimeae

White kauai rosemallow

Anthoxanthum nitens

Holy-grass

Hillebrandia sandwicensis

Huperzia erosa

Hirtella rugosa

Hoffmannseggia densiflora var. demissa

Ivesia arizonica var. arizonica

Hygrohypnum palustre

Hippocrepis emerus

Scorpion-senna

Hodgsonia heteroclita