Heliconia psittacorum
Parrot's Beak
Heliconia rostrata
Hanging Lobster Claw
Heliotropium indicum
Indian Heliotrope
Helleborus foetidus
Stinking Hellebore
Helleborus viridis
Green Hellebore
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
Heterotis rotundifolia
Spanish Shawl
Hibiscus tiliaceus
Sea Hibiscus
Hieracium angustatiforme
Small-leaved Hawkweed
Hieracium apheles
Hepste Hawkweed
Hieracium attenboroughianum
Attenborough’s Hawkweed
Hieracium breconense
Brecon Hawkweed
Hieracium breconicola
Beacon's Hawkweed
Hieracium clivicola
Hill Hawkweed
Hieracium discophyllum
Disc-leaved Hawkweed
Hieracium hypochaeroides
Cat's-ear Hawkweed
Hieracium inspissatum
Crass-leaved Hawkweed
Hieracium leyanum
Fat-leaved Hawkweed
Hieracium neocoracinum
Craig Gleisiad Hawkweed
Hieracium reticulatiforme
Reticulate-leaved Hawkweed
Hieracium sabaudum
Autumn Hawkweed
Hieracium sanguineum
Bloody Hawkweed
Hieracium sp.
Hieracium stenopholidium
Western Hawkweed
Hieracium subbritannicum
Limestone Hawkweed
Hieracium tavense
Tawe Hawkweed
Himantoglossum hircinum
Lizard Orchid
Hippeastrum puniceum
Amaryllis Lily
Hippobroma longiflora
Star of Bethlehem
Hirudo medicinalis
Holmskioldia sanguinea
Chinese Hat Plant
Homalanthus populifolius
Bleeding Heart
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
Hydrocotyle vulgaris
Marsh Pennywort
Hylotelephium telephium
Orpine
Hymenocallis fragrans
Spider Lily
Hymenocallis littoralis
Beach Spider Lily
Hymenophyllum tunbrigense
Tunbridge Filmy-fern
Hyophorbe lagenicaulis
Bottle Palm
Hyoscyamus niger
Henbane
Hypericum humifusum
Trailing St John's-wort
Hypericum x inodorum
Tall Tutsan
Hypopitys monotropa
Yellow Bird's-nest
Hyptis capitata
False Ironwort
Illecebrum verticillatum
Coral-necklace
Impatiens balsamina
Garden Balsam
Impatiens noli-tangere
Touch-me-not Balsam
Impatiens parviflora
Small Balsam
Impatiens walleriana
Busy Lizzie
Imperata cylindrica
Cogon Grass
Indigofera hirsuta
Hairy Indigo
Indigofera suffruticosa
Guatemalan Indigo
Inonotus hispidus
Shaggy Bracket
Inula helenium
Elecampane
Ipomoea aquatica
Water Spinach
Ipomoea batatas
Sweet Potato
Ipomoea carnea
Pink Morning Glory
Ipomoea hederacea
Ivy-leaved Morning Glory
Ipomoea nil
Picotee Morning Glory