Verbatim text: Costea, M. and F. J. Tardif. 2005. Taxonomy of the Polygonum douglasii (Polygonaceae) complex with a new species from Oregon. Brittonia 57: 1–27.
Author: Costea, M., Tardif, F.J.
Year: 2005
Title: Taxonomy of the Polygonum douglasii (Polygonaceae) complex with a new species from Oregon
Journal: Brittonia
Volume: 57
Pages: 1–27