Euphorbia esula subsp. tommasiniana

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 : 226

(b) Subsp. tommasiniana (Bertol.) Nyman, Consp. 652 (1881)

(£. virgata Waldst. & Kit. , non Desf.; incl. E. subcordata Ledeb. , E. tenuifolia Lam. , E. uralensis Fischer ex Link ).

Axillary rays usually 2-12; leaves linear to lanceolate, sometimes widened and rounded at base, acute or subacute; umbel usually with 5-9 rays. 2« = 20. 5., E. & E.C. Europe; the hybrid with subsp. esula often naturalized elsewhere. E. leptocaula Boiss. in DC., Prodr, 15(2): 159 (1862) (£. astrachanica C. A. Meyer ex Prokh., E. borszczowii Prokh. ), from E. Romania and U.S.S.R., is like subsp. tommasiniana but usually smaller. It is often puberulent and usually has narrowly linear leaves up to 85 mm but less than 4 mm wide. E. sareptana A. Becker ex Boiss. in DC., Prodr. 15(2): 159 (1862) (£. tanaitica Paez. ), from S.E. Russia, is similar but has leaves up to 11 mm wide, oblanceolate to obovate or elliptic-obovate and strongly emarginate. They may merit subspecific rank.