Hackelia deflexa (Wahlenb.) Opiz (Synonym : Echinospermum matsudairai Makino)

Family : Boraginaceae

Hainardia cylindrica (Willd.) Greuter (Synonym : Rottboellia cylindrica Willd.)

Family : Poaceae [Naturalized plant]

Halenia coreana S.M.Han, H.Won & C.E.Lim

Family : Gentianaceae

Haloragis micrantha (Thunb.) R.Br. ex Siebold & Zucc. (Synonym : Goniocarpus micranthus (Thunb.) K.D.Koenig)

Family : Haloragaceae

Hamamelis japonica Siebold & Zucc. (Synonym : Hamamelis arborea Ottol. ex Mast.)

Family : Hamamelidaceae

Hanabusaya asiatica (Nakai) Nakai (Synonym : Symphyandra asiatica Nakai)

Family : Campanulaceae

Hanabusaya latisepala Nakai (Synonym : Hanabusaya asiatica (Nakai) Nakai var. latisepala (Nakai) W.T.Lee)

Family : Campanulaceae

Haplopteris flexuosa (Fée) E.H.Crane (Synonym : Haplopteris modesta (Hand.-Mazz.) E.H.Crane)

Family : Pteridaceae

Haplopteris zosterifolia (Willd.) E.H.Crane (Synonym : Vittaria merrillii Christ)

Family : Pteridaceae

Hedera rhombea (Miq.) Siebold & Zucc. ex Bean (Synonym : Hedera helix L. var. rhombea Miq.)

Family : Araliaceae