[1]
Will, C. 2010. The European Garden Flora; a manual for the identification of plants cultivated in Europe, both out-of-doors and under glass. Volume III, Dicotyledones (Part I), edited by S.M. Walters and others. Edinburgh Journal of Botany. 48, 1 (Apr. 2010), 131–132. DOI:https://doi.org/10.1017/S0960428600003711.