Helleborus viridis
Green Hellebore
Helosciadium nodiflorum
Fool's-water-cress
Hordeum distichon
Two-rowed Barley
Humulus lupulus
Hop
Hyacinthoides hispanica
Spanish Bluebell
Hyacinthoides non-scripta
Bluebell
Hydrocotyle vulgaris
Marsh Pennywort
Hylotelephium telephium
Orpine
Hypericum
Hypericum androsaemum
Tutsan
Hypericum calycinum
Rose-of-Sharon
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
Iberis amara
Wild Candytuft
Isatis tinctoria
Woad
Jasione montana
Sheep's-bit
Jasminum nudiflorum
Winter Jasmine
Juncus articulatus
Jointed Rush
Juncus compressus
Round-fruited Rush
Juncus gerardii
Saltmarsh Rush
Juncus squarrosus
Heath Rush