Fraxinus excelsior
Ash
Fumaria bastardii
Tall Ramping-fumitory
Fumaria muralis
Common Ramping-fumitory
Fumaria officinalis
Common Fumitory
Fumaria purpurea
Purple Ramping-fumitory
Furcraea foetida
Giant Cabuya
Gagea bohemica
Early Star-of-Bethlehem
Gagea lutea
Yellow Star-of-Bethlehem
Galeopsis bifida
Bifid Hemp-nettle
Galeopsis tetrahit sens str
Common Hemp-nettle
Galinsoga quadriradiata
Shaggy Soldier
Galium album
Hedge Bedstraw
Galium odoratum
Woodruff
Galium palustre
Marsh-bedstraw
Galium sterneri
Limestone Bedstraw
Galium uliginosum
Fen Bedstraw
Gardenia jasminoides
Cape Jasmine
Genista anglica
Petty Whin
Genista pilosa
Hairy Greenweed
Genista tinctoria
Dyer's Greenweed
Gentianella amarella
Autumn Gentian
Gentianella germanica
Chiltern Gentian
Geranium columbinum
Long-stalked Crane's-bill
Geranium dissectum
Cut-leaved Crane's-bill
Geranium lucidum
Shining Crane's-bill
Geranium macrorrhizum
Rock Crane's-bill
Geranium molle
Dove's-foot Crane's-bill
Geranium pratense
Meadow Crane's-bill
Geranium purpureum
Little-Robin
Geranium pusillum
Small-flowered Crane's-bill
Geranium pyrenaicum
Hedgerow Crane's-bill
Geranium robertianum
Herb-Robert
Geranium sanguineum
Bloody Crane's-bill
Geranium sylvaticum
Wood Crane's-bill
Geranium x oxonianum
Druce's Crane's-bill
Geum rivale
Water Avens
Geum urbanum
Wood Avens
Ginkgo biloba
Maidenhair-tree
Glyceria fluitans
Floating Sweet-grass
Glycosmis parviflora
Jamaican Mandarin-orange
Gmelina arborea
Beechwood
Gnaphalium uliginosum
Marsh Cudweed
Goeppertia louisae
Goeppertia majestica
Majestic Prayer Plant
Gomphrena serrata
Prostrate Globe Amaranth
Graptophyllum pictum
Caricature-plant
Griselinia littoralis
New Zealand Broadleaf
Grona triflora
Creeping Tick Trefoil
Guizotia abyssinica
Niger
Gunnera tinctoria
Giant-rhubarb
Gymnadenia conopsea
Fragrant Orchid
Gymnocarpium dryopteris
Oak Fern
Gymnocarpium robertianum
Limestone Fern
Hammarbya paludosa
Bog Orchid
Hedera helix sens lat
Ivy
Hedera hibernica
Atlantic Ivy
Helianthemum nummularium
Common Rock-rose
Helianthus annuus
Sunflower
Heliconia psittacorum
Parakeetflower
Helleborus foetidus
Stinking Hellebore
Helleborus viridis
Green Hellebore
Helminthotheca echioides
Bristly Oxtongue
Helosciadium inundatum
Lesser Marshwort
Helosciadium nodiflorum
Fool's-water-cress
Heptapleurum arboricola
Dwarf Umbrella Tree
Heracleum mantegazzianum
Giant Hogweed
Heracleum sphondylium
Hogweed
Hesperis matronalis
Dame's-violet
Heterotis rotundifolia
Spanish Shawl
Hibiscus tiliaceus
Sea Hibiscus