Geum x intermedium
Hybrid Avens
Glaucium flavum
Yellow Horned-poppy
Glebionis segetum
Corn Marigold
Glechoma hederacea
Ground-ivy
Glyceria declinata
Small Sweet-grass
Glyceria fluitans
Floating Sweet-grass
Gnaphalium uliginosum
Marsh Cudweed
Guizotia abyssinica
Niger
Gymnadenia borealis
Heath Fragrant-orchid
Gymnadenia conopsea
Fragrant Orchid
Gymnadenia densiflora
Marsh Fragrant-orchid
Hamamelis spp.
Witch-hazel
Hammarbya paludosa
Bog Orchid
Hedera helix
Common Ivy
Hedera hibernica
Atlantic Ivy
Helichrysum arenarium
Helichrysum italicum
Curry-plant
Helleborus foetidus
Stinking Hellebore
Helleborus viridis
Green Hellebore
Helminthotheca echioides
Bristly Oxtongue
Helosciadium inundatum
Lesser Marshwort
Helosciadium nodiflorum
Fool's-water-cress
Heracleum mantegazzianum
Giant Hogweed
Heracleum sphondylium
Hogweed