The Genus Zygorhynchus

Abstract

The genus Zygorhynchus Vuillemin, which has had 17 species and varieties described in it, has been studied. It is concluded that there are 6 species and 1 variety including 1 new species, Z. californiensis, and a new variety, Z. exponens var. smithii. In addition Z exponens Burgeff, Z. moelleri Vuill., Z. macrocarpus Ling-Young, Z. heterogamus (Vuill.) Vuill. and Z. japonicus Kominami are recognized. Z. vuille-minii Namysl. has been reduced to synonymy under Z. moelleri, and Z. hennebergii Naumov is considered a doubtful species.