Gomphocarpus physocarpus
Balloon Plant
Grimmia pulvinata
Gymnadenia conopsea
Fragrant Orchid
Hedera hibernica
Atlantic Ivy
Heliconia psittacorum
Parakeetflower
Helleborus foetidus
Stinking Hellebore
Helosciadium inundatum
Lesser Marshwort
Helosciadium nodiflorum
Fool's-water-cress
Heracleum mantegazzianum
Giant Hogweed
Heracleum sphondylium
Hogweed
Hesperis matronalis
Dame's-violet
Hieracium repandulare
Hippophae rhamnoides
Sea-buckthorn
Hippuris vulgaris
Mare's-tail
Hirschfeldia incana
Hoary Mustard
Honckenya peploides
Sea Sandwort
Hornungia petraea
Hutchinsia
Humulus lupulus
Hop
Hydrocotyle vulgaris
Marsh Pennywort
Hypericum androsaemum
Tutsan
Hypericum hircinum
Stinking Tutsan
Hypericum humifusum
Trailing St John's-wort
Hypopitys monotropa
Yellow Bird's-nest
Hyptis capitata
False Ironwort
Iberis amara
Wild Candytuft
Iberis umbellata
Garden Candytuft
Ilex aquifolium
Holly
Impatiens glandulifera
Indian Balsam
Iris foetidissima
Stinking Iris
Isatis tinctoria
Woad
Isolepis setacea
Bristle Club-rush
Jatropha gossypiifolia
Bellyache Bush
Jatropha podagrica
Gout-plant
Juglans regia
Walnut
Juncus acutus
Sharp Rush
Juncus articulatus
Jointed Rush
Juncus bulbosus
Bulbous Rush
Juncus compressus
Round-fruited Rush
Juncus inflexus
Hard Rush
Juncus tenuis
Slender Rush
Juniperus communis
Juniper
Laburnum anagyroides
Laburnum
Lactuca saligna
Least Lettuce
Lactuca serriola
Prickly Lettuce
Lapsana communis
Nipplewort
Lathraea squamaria
Toothwort
Lathyrus aphaca
Yellow Vetchling
Lathyrus japonicus
Sea Pea
Lathyrus latifolius
Broad-leaved Everlasting-pea
Lathyrus linifolius
Bitter-vetch
Lathyrus nissolia
Grass Vetchling
Lathyrus pratensis
Meadow Vetchling
Lathyrus vernus
Leontodon saxatilis
Lesser Hawkbit
Lepidium didymum
Lesser Swine-cress
Lepidium draba
Hoary Cress
Lepidium heterophyllum
Smith's Pepperwort
Lepidium ruderale
Narrow-leaved Pepperwort
Lepidium sativum
Garden Cress
Leucojum aestivum
Summer Snowflake
Leycesteria formosa
Himalayan Honeysuckle
Licuala grandis
Ruffled Fan Palm
Ligustrum ovalifolium
Garden Privet
Ligustrum vulgare
Wild Privet
Limosella aquatica
Mudwort
Linaria purpurea
Purple Toadflax
Linaria repens
Pale Toadflax
Linum catharticum
Fairy Flax
Linum usitatissimum
Flax
Liparis loeselii
Fen Orchid