Hypopitys monotropa
Yellow Bird's-nest
Ilex aquifolium
Holly
Illecebrum verticillatum
Coral-necklace
Impatiens glandulifera
Indian Balsam
Impatiens noli-tangere
Touch-me-not Balsam
Impatiens parviflora
Small Balsam
Inonotus dryadeus
Oak Bracket
Inonotus hispidus
Shaggy Bracket
Inula conyzae
Ploughman's-spikenard
Inula crithmoides
Golden-samphire
Inula helenium
Elecampane
Iris foetidissima
Stinking Iris
Iris pseudacorus
Yellow Iris
Isoetes echinospora
Spring Quillwort
Isolepis setacea
Bristle Club-rush
Jasione montana
Sheep's-bit
Jasminum nudiflorum
Winter Jasmine
Juglans regia
Walnut
Juncus acutiflorus
Sharp-flowered Rush
Juncus acutus
Sharp Rush
Juncus articulatus
Jointed Rush
Juncus bufonius
Toad Rush
Juncus bulbosus
Bulbous Rush
Juncus compressus
Round-fruited Rush