Hellenia speciosa
Crêpe Ginger
Helminthotheca echioides
Bristly Oxtongue
Henosepilachna argus
Bryony Ladybird
Heptapleurum arboricola
Dwarf Umbrella Tree
Heracleum mantegazzianum
Giant Hogweed
Hesperis matronalis
Dame's-violet
Hibiscus tiliaceus
Sea Hibiscus
Hieracium breconicola
Beacon's Hawkweed
Hieracium inspissatum
Crass-leaved Hawkweed
Himantoglossum hircinum
Lizard Orchid
Hippeastrum puniceum
Amaryllis Lily
Hippobroma longiflora
Star of Bethlehem
Hirudo medicinalis
Holmskioldia sanguinea
Chinese Hat Plant
Homalomena rubescens
Shield Plant
Hordeum vulgare
Six-rowed Barley
Hornungia petraea
Hutchinsia
Houttuynia cordata
Fish-plant
Huperzia selago
Fir Clubmoss
Hyacinthoides non-scripta
Bluebell
Hydrangea macrophylla
Hydrangea
Hylotelephium telephium
Orpine
Hymenocallis fragrans
Spider Lily
Hymenophyllum tunbrigense
Tunbridge Filmy-fern