no HD illustration available (m2)
6 184044 Calystegia silvatica (Kit. in Schrader) Griseb. [125 271166 Convolvulus silvaticus Kit. in Schrader]
V.L. Komarov (Komorov), Fl. URSS, vol. 19 : t. 2, fig. 3 (1934-1964)