Typification of Aristolochia saccata and Nomenclatural Notes for A. dilatata (Aristolochiaceae)

A specimen collected from Nepal in 1821 by Wallich (2707.B in the Wallich Catalogue), stored at the Herbarium of the Royal Botanic Gardens Kew (K), is designated here as the lectotype of Aristolochia saccata Wall. In addition, the nomenclature for A. saccata var. dilatata Hook. f., A. dilatata N. E. Br., and Isotrema dilatatum (N. E. Br.) X. X. Zhu, S. Liao & J. S. Ma is considered. Since the name A. dilatata is based on A. saccata var. dilatata Hook. f., it is regarded that I. dilatatum was validly published as a new combination based on A. saccata var. dilatata Hook. f., and the correct author citation is “(Hook. f.) X. X. Zhu, S. Liao & J. S. Ma.”