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
Gomphrena serrata
Prostrate Globe Amaranth
Goodyera repens
Creeping Lady's-tresses
Grimmia pulvinata
Grey-cushioned Grimmia
Guizotia abyssinica
Niger
Gunnera tinctoria
Giant-rhubarb
Gymnadenia borealis
Heath Fragrant-orchid
Gymnadenia conopsea
Fragrant Orchid
Gymnadenia densiflora
Marsh Fragrant-orchid
Gymnocarpium dryopteris
Oak Fern
Gymnocarpium robertianum
Limestone Fern
Hammarbya paludosa
Bog Orchid
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