Hypericum hirsutum
Hairy St John's-wort
Hypericum humifusum
Trailing St John's-wort
Hypericum maculatum
Imperforate St John's-wort
Hypericum perforatum
Perforate St John's-wort
Hypericum pulchrum
Slender St John's-wort
Hypericum x caesariense
Hypholoma fasciculare
Sulphur Tuft
Hypnum cupressiforme
Hypochaeris maculata
Spotted Cat's-ear
Hypochaeris radicata
Cat's-ear
Hypopitys monotropa
Yellow Bird's-nest
Iberis amara
Wild Candytuft
Ilex aquifolium
Holly
Impatiens glandulifera
Indian Balsam
Impatiens noli-tangere
Touch-me-not Balsam
Inachis io
European Peacock Butterfly
Inonotus dryadeus
Oak Bracket
Iris foetidissima
Stinking Iris
Iris pseudacorus
Yellow Iris
Iris unguicularis
Algerian Iris
Isatis tinctoria
Woad
Isolepis setacea
Bristle Club-rush
Jacobaea aquatica
Marsh Ragwort
Jacobaea vulgaris
Common Ragwort