Glyceria declinata
Small Sweet-grass
Glyceria fluitans
Floating Sweet-grass
Gnaphalium uliginosum
Marsh Cudweed
Guizotia abyssinica
Niger
Gymnadenia conopsea
Fragrant Orchid
Gymnetron villosulum
Gymnocarpium dryopteris
Oak Fern
Gymnocarpium robertianum
Limestone Fern
Hedera hibernica
Atlantic Ivy
Helianthemum nummularium
Common Rock-rose
Helianthus annuus
Sunflower
Helleborus viridis
Green Hellebore
Helosciadium nodiflorum
Fool's-water-cress
Heracleum mantegazzianum
Giant Hogweed
Heracleum sphondylium
Hogweed
Hieracium agg
A Hawkweed
Hieracium angustatiforme
Small-leaved Hawkweed
Hieracium apheles
Hepste Hawkweed
Hieracium argillaceum
Southern Hawkweed
Hieracium attenboroughianum
Attenborough’s Hawkweed
Hieracium breconense
Brecon Hawkweed
Hieracium breconicola
Beacon's Hawkweed
Hieracium cillense
Craig y Cilau Hawkweed
Hieracium clivicola
Hill Hawkweed
Hieracium discophyllum
Disc-leaved Hawkweed
Hieracium hypochaeroides
Cat's-ear Hawkweed
Hieracium inspissatum
Crass-leaved Hawkweed
Hieracium leyanum
Fat-leaved 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 sp.
Hieracium spp
Hieracium stenopholidium
Western Hawkweed
Hieracium subbritannicum
Limestone Hawkweed
Hieracium tavense
Tawe Hawkweed
Hippuris vulgaris
Mare's-tail
Hornungia petraea
Hutchinsia
Huperzia selago
Fir Clubmoss
Hyacinthoides hispanica
Spanish Bluebell
Hyacinthoides non-scripta
Bluebell
Hyacinthoides x massartiana
Garden Bluebell
Hydrangea sp
Hydrocotyle vulgaris
Marsh Pennywort
Hygrocybe conica
Blackening Wax Cap
Hygrocybe miniata
Hygrocybe psittacina
Parrot Waxcap
Hygrocybe sp.
Hygrocybe virginea
Snowy Waxcap
Hylotelephium telephium
Orpine
Hymenophyllum tunbrigense
Tunbridge Filmy-fern
Hymenophyllum wilsonii
Wilson's Filmy-fern
Hypericum androsaemum
Tutsan
Hypericum hirsutum
Hairy St John's-wort
Hypericum humifusum
Trailing St John's-wort
Hypericum pulchrum
Slender St John's-wort
Hypericum x inodorum
Tall Tutsan
Hypholoma fasciculare
Sulphur Tuft
Hypochaeris radicata
Cat's-ear
Hypogymnia tubulosa
Hypopitys monotropa
Yellow Bird's-nest
Ilex aquifolium
Holly
Impatiens glandulifera
Indian Balsam
Inonotus dryadeus
Oak Bracket
Inula helenium
Elecampane
Iris pseudacorus
Yellow Iris