Gymnocarpium robertianum
Limestone Fern
Hedera hibernica
Atlantic Ivy
Helianthemum nummularium
Common Rock-rose
Helianthus annuus
Sunflower
Helleborus viridis
Green Hellebore
Helosciadium nodiflorum
Fool's-water-cress
Heracleum mantegazzianum
Giant Hogweed
Heracleum sphondylium
Hogweed
Hieracium agg
A Hawkweed
Hieracium argillaceum
Southern Hawkweed
Hieracium cillense
Craig y Cilau Hawkweed
Hieracium repandulare
Hieracium sect. Oreadea
Hieracium sect. Sabauda
Hieracium spp
Hieracium subbritannicum
Hippuris vulgaris
Mare's-tail
Hornungia petraea
Hutchinsia
Huperzia selago
Fir Clubmoss
Hyacinthoides hispanica
Spanish Bluebell
Hyacinthoides non-scripta
Bluebell
Hyacinthoides x massartiana
Garden Bluebell
Hydrangea sp
Hydrocotyle vulgaris
Marsh Pennywort