Hieracium cillense
Craig y Cilau Hawkweed
Hieracium lanatum
Hieracium maculatum
Spotted Hawkweed
Hieracium repandulare
Repand-leaved Hawkweed
Hieracium sect. Sabauda
Hieracium sect. Stelligera
Hawkweed (Stelligera)
Hieracium sect. Vulgata
Hieracium subbritannicum
Hippobroma longiflora
Star of Bethlehem
Hippuris vulgaris
Mare's-tail
Hopea ferrea
Malut
Hornungia petraea
Hutchinsia
Hottonia palustris
Water-violet
Houttuynia cordata
Fish-plant
Humulus lupulus
Hop
Huperzia selago
Fir Clubmoss
Hyacinthoides italica
Italian Bluebell
Hyacinthoides non-scripta
Bluebell
Hydrangea quercifolia
Oak-leaved Hydrangea
Hydrocotyle vulgaris
Marsh Pennywort
Hylotelephium telephium
Orpine
Hymenophyllum tunbrigense
Tunbridge Filmy-fern
Hymenophyllum wilsonii
Wilson's Filmy-fern
Hyoscyamus niger
Henbane