Lactuca serriola
Prickly Lettuce
Lactuca virosa
Great Lettuce
Lagarosiphon major
Curly Waterweed
Lamiastrum galeobdolon
Garden Yellow Archangel
Lamium amplexicaule
Henbit Dead-nettle
Lamium purpureum
Red Dead-nettle
Lantana camara
Common Lantana
Lantana canescens
Lantana montevidensis
Trailing Lantana
Lapsana communis
Nipplewort
Larix
Bonsai Larch
Larix x marschlinsii
Hybrid Larch
Lathyrus aphaca
Yellow Vetchling
Lathyrus japonicus
Sea Pea
Lathyrus latifolius
Broad-leaved Everlasting-pea
Lathyrus linifolius
Bitter-vetch
Lathyrus nissolia
Grass Vetchling
Lathyrus odoratus
Sweet Pea
Lathyrus pratensis
Meadow Vetchling
Lathyrus sylvestris
Narrow-leaved Everlasting-pea
Lathyrus vernus
Spring Pea
Ledebouria socialis
Silver Squill
Lemna minor
Common Duckweed
Lemna trisulca
Ivy-leaved Duckweed
Lemna valdiviana
Leontodon hispidus
Rough Hawkbit
Leontodon saxatilis
Lesser Hawkbit
Leonurus cardiaca
Motherwort
Lepidium didymum
Lesser Swine-cress
Lepidium draba
Hoary Cress
Lepidium heterophyllum
Smith's Pepperwort
Lepidium latifolium
Dittander
Lepidium ruderale
Narrow-leaved Pepperwort
Lepidium sativum
Garden Cress
Leucophyllum frutescens
Texas Sage
Leuenbergeria bleo
Rose Cactus
Leycesteria formosa
Himalayan Honeysuckle
Leymus arenarius
Lyme-grass
Licuala grandis
Ruffled Fan Palm
Lilium hansonii
Limbarda crithmoides
Golden-samphire
Limonium binervosum agg.
Rock Sea-lavender (Newborough)
Limosella aquatica
Mudwort
Limosella australis
Welsh Mudwort
Linaria purpurea
Purple Toadflax
Linaria repens
Pale Toadflax
Linum catharticum
Fairy Flax
Linum usitatissimum
Flax
Liparis loeselii
Fen Orchid
Liriodendron tulipifera
Tulip-tree
Lithospermum officinale
Common Gromwell
Littorella uniflora
Shoreweed
Livistona chinensis
Chinese Fan Palm
Lobelia nummularia
Common Pratia
Lobelia urens
Heath Lobelia
Lonicera pileata
Box-leaved Honeysuckle
Lonicera xylosteum
Fly Honeysuckle
Lotus pedunculatus
Greater Bird's-foot-trefoil
Lotus subbiflorus
Hairy Bird's-foot-trefoil
Lotus tenuis
Narrow-leaved Bird's-foot-trefoil
Ludwigia palustris
Hampshire-purslane
Luma apiculata
Chilean Myrtle
Lumnitzera racemosa
White-flowered Black Mangrove
Lunaria annua
Honesty
Luzula nivea
Snow-white Wood-rush
Luzula pilosa
Hairy Wood-rush
Luzula sylvatica
Great Wood-rush
Lycopodium clavatum
Stag's-horn Clubmoss
Lycopus europaeus
Gypsywort
Lysichiton americanus
American Skunk-cabbage