Betula procurva Litv. [ Betula schugnanica (B.Fedtsch.) Litv.]
no HD illustration available (m1)
Betula procurva Litv. [ Betula alba var. schugnanica B.Fedtsch.] [Betulaceae]
V.L. Komarov (Komorov), Fl. URSS, vol. 5 : p. 297, t. 15, fig. 4 (1934-1964)