Mosyakin, Sergei/Wagner, Warren L. 1998. Notes on two alien taxa of Rumex L. (Polygonaceae) naturalized in the Hawaiian Islands. In: Evenhuis, Neal L. and Miller, Scott, E., eds. Records of the Hawaii Biological Survey for 1997. Part 1: Articles. Bishop Museum Occasional Papers. 55:39-44.
Online details: http://hbs.bishopmuseum.org/pdf/rumex.pdf