• Iberis sempervirens ‘Absolutely Amethyst’
• Iberis sempervirens ‘Findel’
• Iberis sempervirens ‘Pink Ice’
• Iberis sempervirens ‘Snowflake’
• Impatiens omeiana ‘Ice Storm’
• Impatiens omeiana ‘Sango’
• Incarvillea delavayi
• Incarvillea delavayi ‘Snowtop’
• Inula ensifolia
• Inula helenium
• Inula hookeri
• Inula magnifica
• Inula magnifica ‘Sonnenstrahl’
• Inula orientalis
• Iris ‘Cherry Garden’
• Iris ‘Immortality’
• Iris barbata-nana ‘Dream Stuff’
• Iris barbata-nana ‘Stockholm’
• Iris chrysographes ‘Black Form’
• Iris ensata
• Iris ensata ‘Crystal Halo’
• Iris ensata ‘Lady in Waiting’
• Iris ensata ‘Topas’
• Iris ensata ‘Variegata’
• Iris ensata ‘White Ladies’
• Iris foetidissima
• Iris foetidissima ‘Citrina’
• Iris foetidissima ‘Fructo-Albo’
• Iris germanica ‘White Knight’
• Iris graminea
• Iris pseudacorus
• Iris pseudacorus ‘Variegata’
• Iris pumila ‘Atroviolacea’
• Iris pumila ‘Blue Denim’
• Iris sibirica
• Iris sibirica ‘Blue King’
• Iris sibirica ‘Butter and Sugar’
• Iris sibirica ‘Caesar’s Brother’
• Iris sibirica ‘Contrast in Styles’
• Iris sibirica ‘Flight of Butterflies’
• Iris sibirica ‘Gull’s Wing’
• Iris sibirica ‘Kabluey’
• Iris sibirica ‘Miss Apple’
• Iris sibirica ‘Not Quite White’
• Iris sibirica ‘Paprikash’
• Iris sibirica ‘Perry’s Blue’
• Iris sibirica ‘Persimmon’
• Iris sibirica ‘Ruffled Velvet’
• Iris sibirica ‘Silver Edge’
• Iris sibirica ‘Sparkling Rose’
• Iris sibirica ‘Swan in Flight’
• Iris sibirica ‘Tipped in Blue’
• Iris sibirica ‘White Swirl’
• Iris sibirica ‘White Wings’
• Iris sibirica ‘Yellow Tail’
• Iris spuria
• Iris spuria hybriden
• Iris tetrasibtosa ‘Three Quarters’
• Isodon longitubus
• Isodon rubescens
• Isodon shikokianus var. intermedius
• Isodon umbrosus ‘Dark Form’
• Isotoma fluviatilis
• Isotoma fluviatilis ‘Alba’