Laburnum Fabr.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 86

8. Laburnum Fabr. 1

Trees or shrubs. Leaves 3-foliolate. Flowers in simple, axillary or pseudoterminal, leafless racemes, pendent at anthesis. Calyx campanulate, slightly bilabiate, the lips undivided or shortly toothed; corolla yellow; stamens monadelphous. Legume slightly constricted between the seeds, dehiscent. Seeds numerous, estrophiolate, compressed.

Twigs appressed-pubescent, greyish-green; legume appressedpubescent, later ± glabrous 1. anagyroides Twigs glabrescent, green; legume glabrous 2. alpinum