T. G. Tutin, N. A. Burges, A. O. Chater, J. R. Edmondson, V. H. Heywood, D. M. Moore, D. H. Valentine, S. M. Walters & D. A. Webb, Flora Europaea 1, ed. 2. 1993
but modified and names used differing
1Inflorescence usually composed of distinct though sometimes small, axillary, dichasial cymes; sepals in fruit free almost to base
1'Inflorescence composed of small, axillary, sessile clusters of flowers; sepals in fruit more or less connate
2Sepals in fruit connate to near apex; calyx saccate and net-veined dorsally; seeds 0.9-1.5 mm in diam.; leaves mostly pinnatifid
2'Sepals in fruit free at least in the upper half; calyx neither saccate nor net-veined dorsally, seeds 0.5-0.8 mm in diam.; leaves usually lanceolate, entire, dentate or rarely laciniate