Hesperis matronalis
Dame's-violet
Himantoglossum hircinum
Lizard Orchid
Hippocrepis comosa
Horseshoe Vetch
Hippophae rhamnoides
Sea-buckthorn
Hippuris vulgaris
Mare's-tail
Holcus lanatus
Yorkshire-fog
Honckenya peploides
Sea Sandwort
Hordeum secalinum
Meadow Barley
Hottonia palustris
Water-violet
Humulus lupulus
Hop
Huperzia selago
Fir Clubmoss
Hyacinthoides hispanica
Spanish Bluebell
Hyacinthoides non-scripta
Bluebell
Hydrocharis morsus-ranae
Frogbit
Hydrocotyle vulgaris
Marsh Pennywort
Hylotelephium telephium
Orpine
Hymenophyllum tunbrigense
Tunbridge Filmy-fern
Hymenophyllum wilsonii
Wilson's Filmy-fern
Hypericum androsaemum
Tutsan
Hypericum calycinum
Rose-of-Sharon
Hypericum elodes
Marsh St John's-wort
Hypericum hirsutum
Hairy St John's-wort
Hypericum humifusum
Trailing St John's-wort
Hypericum maculatum
Imperforate St John's-wort