Salix purpurea subsp. lambertiana, (Sm.) A. Neumann ex Rech.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 53

(b) Subsp. lambertiana (Sm.) A. Neumann ex Rech. fil., Österr. Bot. Zeitschr. 110: 341 (1963):

At least some leaves opposite, more or less broadly Ungulate, narrowly rounded at the base, serrate for almost their whole length, 4-8 times as long as wide on long twigs, c. 4 times as long as wide on short twigs; petiole rs—/o as long as the leaf. Widespread, mainly in the lowlands.

S. purpurea x viminalis (S. x rubra Hudson ) is a frequent hybrid.

S. x forbyana Sm., an exceptionally vigorous bush, is probably S. atrocinerea x purpurea *, viminalis', it has yellowish twigs and dark green, lustrous leaves (resembling the leaves of S. triandra ). The female catkins are like those of 5. purpurea ; the male plant is unknown.