Himantoglossum hircinum
Lizard Orchid
Hirschfeldia incana
Hoary Mustard
Hordeum distichon
Two-rowed Barley
Hordeum murinum
Wall Barley
Hordeum vulgare
Six-rowed Barley
Humulus lupulus
Hop
Hyacinthoides hispanica
Spanish Bluebell
Hylotelephium telephium
Orpine
Hypericum androsaemum
Tutsan
Hypericum calycinum
Rose-of-Sharon
Hypericum humifusum
Trailing St John's-wort
Hypericum maculatum
Imperforate St John's-wort
Hypericum montanum
Pale St John's-wort
Illecebrum verticillatum
Coral-necklace
Inula helenium
Elecampane
Isatis tinctoria
Woad
Jacobaea vulgaris
Common Ragwort
Juglans regia
Walnut
Juncus bufonius
Toad Rush
Juncus tenuis
Slender Rush
Koenigia polystachya
Himalayan Knotweed
Laburnum anagyroides
Laburnum
Laburnum x watereri
Hybrid Laburnum
Lactuca serriola
Prickly Lettuce