Hornungia petraea (L.) Reichenb.
Hortiboletus rubellus (Krombh.) Simonini, Vizzini & Gelardi 2015
Horvathiolus sp. Josifov, 1965
Horvathiolus superbus (Pollich, 1781)
Horvathiolus syriacus (Reuter, 1885)
Hosta plantaginea Lam. (Asch.)
Howella sherborni (Norman, 1930)
Humulus lupulus L.
Huperzia selago (L.) Bernh. ex Schrank & Mart.
Hyacinthoides hispanica (Mill.) Rothm.
Hyacinthoides non-scripta (L.) Chouard ex Rothm.
Hyacinthoides paivae S.Ortiz & Rodr.Oubiña
Hyacinthoides spp Heist. ex Fabr.