Helianthemum oelandicum
Hoary Rock-rose
Helichrysum italicum
Curry-plant
Helleborus foetidus
Stinking Hellebore
Helleborus viridis
Green Hellebore
Helminthotheca echioides
Bristly Oxtongue
Heracleum sphondylium
Hogweed
Herminium monorchis
Musk Orchid
Hesperis matronalis
Dame's-violet
Hieracium cillense
Craig y Cilau Hawkweed
Hippocrepis comosa
Horseshoe Vetch
Hippuris vulgaris
Mare's-tail
Hirudo medicinalis
Honckenya peploides
Sea Sandwort
Hordeum murinum
Wall Barley
Hornungia petraea
Hutchinsia
Humulus lupulus
Hop
Huperzia selago
Fir Clubmoss
Hyacinthoides hispanica
Spanish Bluebell
Hyacinthoides non-scripta
Bluebell
Hygrocybe calyptriformis
Pink Waxcap
Hygrocybe coccinea
Scarlet waxcap
Hygrocybe conica
Blackening Wax Cap
Hygrocybe miniata
Hygrocybe psittacina
Parrot Waxcap