Wood (1851) described 'Viminalis Incisa' as less compact in habit than U. Viminalis and U. Viminalis Variegata, but nevertheless erect, with slender rod-like branches and more serrated foliage. Wesmael's 'Incisa' (1863) had leaves irregularly sinuate-incised, with long pointed teeth.Green, 1964, p.63
