Sato, Pauline. 1998. A new naturalized plant species in windward O‘ahu, Hawai‘i. In: Evenhuis, Neal L. and Miller, Scott, E., eds. Records of the Hawaii Biological Survey for 1997. Part 2: Notes. Bishop Museum Occasional Papers. 56:15.
Online details: http://hbs.bishopmuseum.org/pdf/op56.pdf