Galeopsis bifida
Bifid Hemp-nettle
Galeopsis tetrahit sens str
Common Hemp-nettle
Galium album
Hedge Bedstraw
Galium aparine
Cleavers
Galium palustre
Marsh-bedstraw
Galium sterneri
Limestone Bedstraw
Galium uliginosum
Fen Bedstraw
Genista anglica
Petty Whin
Genista pilosa
Hairy Greenweed
Gentiana verna
Spring Gentian
Gentianella amarella
Autumn Gentian
Gentianella campestris
Field Gentian
Gentianella germanica
Chiltern Gentian
Geranium columbinum
Long-stalked Crane's-bill
Geranium lucidum
Shining Crane's-bill
Geranium sanguineum
Bloody Crane's-bill
Geum rivale
Water Avens
Geum x intermedium
Hybrid Avens
Glechoma hederacea
Ground-ivy
Glyceria fluitans
Floating Sweet-grass
Guizotia abyssinica
Niger
Gymnadenia borealis
Heath Fragrant Orchid
Gymnadenia conopsea
Chalk Fragrant-orchid
Gymnocarpium dryopteris
Oak Fern
Hammarbya paludosa
Bog Orchid
Helianthemum oelandicum
Hoary Rock-rose
Helichrysum arenarium
Helichrysum italicum
Curry-plant
Helleborus viridis
Green Hellebore
Helminthotheca echioides
Bristly Oxtongue
Helosciadium inundatum
Lesser Marshwort
Heracleum mantegazzianum
Giant Hogweed
Heracleum sphondylium
Hogweed
Hieracium anglicum agg.
Hawkweed (anglicum agg.)
Hieracium daedalolepioides
Petite-leaved Hawkweed
Hieracium maculatum
Spotted Hawkweed
Hieracium repandulare
Repand-leaved Hawkweed
Hieracium sect. Sabauda
Hieracium sect. Vulgata
Hippuris vulgaris
Mare's-tail
Honckenya peploides
Sea Sandwort
Hornungia petraea
Hutchinsia
Humulus lupulus
Hop
Huperzia selago
Fir Clubmoss
Hydrocotyle hirta
Hydrocotyle vulgaris
Marsh Pennywort
Hylotelephium telephium
Orpine
Hymenophyllum wilsonii
Wilson's Filmy-fern
Hypericum androsaemum
Tutsan
Hypericum elodes
Marsh St John's-wort
Hypericum hircinum
Stinking Tutsan
Hypericum hirsutum
Hairy St John's-wort
Hypericum humifusum
Trailing St John's-wort
Hypericum maculatum
Imperforate St John's-wort
Hypericum montanum
Pale St John's-wort
Hypericum perforatum
Perforate St John's-wort
Hypericum pulchrum
Slender St John's-wort
Hypericum tetrapterum
Square-stalked St John's-wort
Hypericum x caesariense
Hypericum x desetangsii
Des Etangs' St John's-wort
Hypopitys monotropa
Yellow Bird's-nest
Iberis amara
Wild Candytuft
Ilex aquifolium
Holly
Inula conyzae
Ploughman's-spikenard
Ipomoea tricolor
Mexican Morning Glory
Isatis tinctoria
Woad
Isoetes lacustris
Quillwort
Isolepis setacea
Bristle Club-rush
Jasione montana
Sheep's-bit
Juglans regia
Walnut