Helleborus argutifolius
Corsican Hellebore
Helleborus foetidus
Stinking Hellebore
Helleborus orientalis
Lenten-rose
Hepatica nobilis
Liverleaf
Heracleum mantegazzianum
Giant Hogweed
Hesperis matronalis
Dame's-violet
Hirschfeldia incana
Hoary Mustard
Hyacinthoides hispanica
Spanish Bluebell
Hyacinthoides italica
Italian Bluebell
Hyacinthoides x massartiana
Garden Bluebell
Hydrangea macrophylla
Hydrangea
Hypericum calycinum
Rose-of-Sharon
Hypericum forrestii
Forrest's Tutsan
Hypericum hircinum
Stinking Tutsan
Hypericum x inodorum
Tall Tutsan
Impatiens glandulifera
Indian Balsam
Impatiens parviflora
Small Balsam
Iris foetidissima
Stinking Iris
Iris sibirica
Siberian Iris
Iris unguicularis
Algerian Iris
Jasminum nudiflorum
Winter Jasmine
Juglans regia
Walnut
Juncus tenuis
Slender Rush
Laburnum anagyroides
Laburnum
Laburnum x watereri
Hybrid Laburnum
Lagarosiphon major
Curly Waterweed
Lagurus ovatus
Hare's-tail
Lamiastrum galeobdolon
Garden Yellow Archangel
Lamium maculatum
Spotted Dead-nettle
Larix decidua
European Larch
Larix kaempferi
Japanese Larch
Larix x marschlinsii
Hybrid Larch
Lathraea clandestina
Purple Toothwort
Lathyrus latifolius
Broad-leaved Everlasting-pea
Laurus nobilis
Bay
Leonurus cardiaca
Motherwort
Lepidium didymum
Lesser Swine-cress
Lepidium draba
Hoary Cress
Leptospermum scoparium
Broom Tea-tree
Leucojum vernum
Spring Snowflake
Leycesteria formosa
Himalayan Honeysuckle
Ligustrum ovalifolium
Garden Privet
Lilium martagon
Martagon Lily
Lilium pyrenaicum
Pyrenean Lily
Linaria arenaria
Sand Toadflax
Linaria purpurea
Purple Toadflax
Linaria supina
Prostrate Toadflax
Linum usitatissimum
Flax
Lobularia maritima
Sweet Alison
Lonicera pileata
Box-leaved Honeysuckle
Lonicera xylosteum
Fly Honeysuckle
Luma apiculata
Chilean Myrtle
Lunaria annua
Honesty
Lupinus polyphyllus
Garden Lupin
Lycium barbarum
Duke#of Argyll's Teaplant
Lysichiton americanus
American Skunk-cabbage
Lysimachia punctata
Dotted Loosestrife
Malcolmia maritima
Virginia Stock
Malva alcea
Greater Musk-mallow
Malva multiflora
Smaller Tree-mallow
Malva setigera
Rough Marsh-mallow
Matricaria discoidea
Pineappleweed
Melampyrum arvense
Field Cow-wheat
Melilotus albus
White Melilot
Melilotus indicus
Small Melilot
Melilotus officinalis
Ribbed Melilot
Mentha x piperita
Peppermint
Morus nigra
Black Mulberry
Muscari armeniacum
Garden Grape-hyacinth
Myriophyllum aquaticum
Parrot's-feather