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
Hydrocotyle vulgaris
Marsh Pennywort
Hylotelephium telephium
Orpine
Hymenocallis fragrans
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 obscura
Obscure Morning Glory
Ipomoea tricolor
Mexican Morning Glory
Ipomoea triloba
Aiea Morning Glory
Isoetes lacustris
Quillwort
Ixora chinensis
Chinese Ixora
Jaapiella veronicae
Jasione montana
Sheep's-bit
Jatropha gossypiifolia
Bellyache Bush
Jatropha integerrima
Jatropha podagrica
Gout-plant
Juncus bulbosus
Bulbous Rush
Juncus effusus
Soft-rush
Juncus Tenuis
Slender Rush
Juniperus chinensis
Chinese Juniper
Justicia brandegeeana
Shrimp Plant
Justicia croceochlamys
Water-willow
Justicia fulvicoma
Mexican Plume
Kalanchoe crenata
Mother of Millions
Kleinhovia hospita
Guest Tree
Laburnum anagyroides
Laburnum
Lactuca saligna
Least Lettuce
Lagerstroemia speciosa
Giant Crepe-myrtle
Lamium amplexicaule
Henbit Dead-nettle
Lantana camara
Common Lantana
Lantana canescens
Lantana montevidensis
Trailing Lantana
Larix decidua
European Larch
Lathraea clandestina
Purple Toothwort
Lathraea squamaria
Toothwort
Lathyrus linifolius
Bitter-vetch
Lathyrus nissolia
Grass Vetchling
Lathyrus pratensis
Meadow Vetchling
Lathyrus sylvestris
Narrow-leaved Everlasting-pea
Ledebouria socialis
Silver Squill
Leontodon saxatilis
Lesser Hawkbit
Lepista flaccida
Tawny Funnel
Lepista nuda