Hedera hibernica
Atlantic Ivy
Helianthemum nummularium
Common Rock-rose
Helianthemum oelandicum
Hoary Rock-rose
Helichrysum italicum
Curry-plant
Heliconia psittacorum
Parrot's Beak
Heliotropium indicum
Indian Heliotrope
Helleborus argutifolius
Corsican Hellebore
Helleborus foetidus
Stinking Hellebore
Helleborus viridis
Green Hellebore
Hellenia speciosa
Crêpe Ginger
Helminthotheca echioides
Bristly Oxtongue
Helosciadium inundatum
Lesser Marshwort
Helosciadium nodiflorum
Fool's-water-cress
Hepatica nobilis
Liverleaf
Heptapleurum arboricola
Dwarf Umbrella Tree
Heracleum mantegazzianum
Giant Hogweed
Heracleum sphondylium
Hogweed
Hesperis matronalis
Dame's-violet
Heterotis rotundifolia
Spanish Shawl
Hevea brasiliensis
Pará Rubber Tree
Hibiscus tiliaceus
Sea Hibiscus
Hieracium anglicum agg.
Hawkweed (anglicum agg.)
Hieracium angustatiforme
Small-leaved Hawkweed
Hieracium apheles
Hepste Hawkweed
Hieracium argillaceum
Southern Hawkweed
Hieracium breconense
Brecon Hawkweed
Hieracium breconicola
Beacon's Hawkweed
Hieracium cillense
Craig y Cilau Hawkweed
Hieracium clivicola
Hill Hawkweed
Hieracium daedalolepioides
Petite-leaved Hawkweed
Hieracium discophyllum
Disc-leaved Hawkweed
Hieracium hypochaeroides
Cat's-ear Hawkweed
Hieracium inspissatum
Crass-leaved Hawkweed
Hieracium lanatum
Hieracium maculatum
Spotted Hawkweed
Hieracium neocoracinum
Craig Gleisiad Hawkweed
Hieracium repandulare
Hieracium reticulatiforme
Reticulate-leaved Hawkweed
Hieracium sabaudum
Autumn Hawkweed
Hieracium sanguineum
Bloody Hawkweed
Hieracium sect. Oreadea
Hieracium sect. Sabauda
Hieracium sect. Vulgata
Hieracium sp.
Hieracium spp
Hieracium stenopholidium
Western Hawkweed
Hieracium subbritannicum
Limestone Hawkweed
Hieracium tavense
Tawe Hawkweed
Himantoglossum hircinum
Lizard Orchid
Hippocrepis comosa
Horseshoe Vetch
Hippophae rhamnoides
Sea-buckthorn
Hippuris vulgaris
Mare's-tail
Hirschfeldia incana
Hoary Mustard
Holcus lanatus
Yorkshire-fog
Homalomena rubescens
Shield Plant
Honckenya peploides
Sea Sandwort
Hordeum distichon
Two-rowed Barley
Hordeum murinum
Wall Barley
Hornungia alpina
Perrenial Hutchinsia
Hornungia petraea
Hutchinsia
Houttuynia cordata
Fish-plant
Humulus lupulus
Hop
Huperzia selago
Fir Clubmoss
Hyacinthoides hispanica
Spanish Bluebell
Hyacinthoides italica
Italian Bluebell
Hyacinthoides non-scripta
Bluebell
Hydrangea petiolaris
Climbing Hydrangea
Hydrocharis morsus-ranae
Frogbit
Hydrocotyle hirta
Hydrocotyle vulgaris
Marsh Pennywort