Hibiscus rosa-sinensis L.

Family : Malvaceae

Hibiscus syriacus L. (Synonym : Ketmia arborea Moench)

Family : Malvaceae

Hibiscus trionum L. (Synonym : Hibiscus uniflorus E.Mey. ex Harv.)

Family : Malvaceae [Naturalized plant]

Hieracium caespitosum Dumort. (Synonym : Pilosella caespitosa (Dumort.) P.D.Sell & C.West)

Family : Asteraceae [Naturalized plant]

Hieracium coreanum Nakai (Synonym : Crepis coreana (Nakai) H.S.Pak f. glabriuscula H.S.Pak)

Family : Asteraceae

Hieracium umbellatum L. (Synonym : Hieracium umbellatum L. var. japonicum H.Hara)

Family : Asteraceae

Hierochloe alpina (Sw. ex Willd.) Roem. & Schult. (Synonym : Holcus alpinus Sw. ex Willd.)

Family : Poaceae

Hierochloe odorata (L.) P.Beauv. (Synonym : Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp)

Family : Poaceae

Hippeastrum hybridum Hort.

Family : Amaryllidaceae

Hippuris vulgaris L.

Family : Hippuridaceae