Kadsura japonica
Kalmia angustifolia
Kalmia latifolia 
Kalmia latifolia 'Elf'
Kalmia latifolia 'Minuet'
Kalmia latifolia 'Ostbo Red'
Kalmia latifolia 'Peppermint'
Kalmia polifolia
Kalopanax pictus
Kalopanax septemlobus
Kalopanax septemlobus var. maximowiczii
Kerria japonica
Koelreuteria elegans subsp. formosana
Koelreuteria henryi
Koelreuteria paniculata
Koelreuteria paniculata 'Coral Sun' ®
Koelreuteria paniculata 'September (Gold)'
Kolkwitzia amabilis 
Kolkwitzia amabilis 'Pink Cloud'