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SUMMARY
The genus Zygorhynchus Vuillemin, which has had 17 species and varieties described in it, has been studied. It is concluded that there are six species and one variety, including one 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. vuilleminii Namysl. has been reduced to synonymy under Z. moelleri, and Z. hennebergii Naumov is considered as a doubtful species.