Epilobium billardiereanum subsp. intermedium P.H.Raven & Engelhorn, New Zealand J. Bot. 9: 348 (1971)
Bibliography
Raven, P.H.; Engelhorn, T. 1971: New Taxa and New Combinations in Australasian Epilobium (Onagraceae). New Zealand Journal of Botany 9: 345–350.
Raven, P.H.; Raven, T. E. 1976: The Genus Epilobium (Onagraceae) in Australasia: a Systematic and Evolutionary Study. New Zealand Department of Scientific and Industrial Research Bulletin 216: 1–321.