Nomenclatural Changes in Polygonum, Persicaria, and Aconogonon (Polygonaceae)

Abstract

Polygonum caurianum subsp. hudsonianum is raised to species rank. Polygonum bistortoides is transferred to Persicaria, and Po¬ lygonum alaskanum var. glabrescens is transferred to Aconogonon. For the forthcoming treatment of Polygonum s.l. for the Flora of North America , several new no¬ menclatural combinations are required to reflect new knowledge in the taxonomy of this group. Polygonum caurianum B. Robinson subsp. hudsonianum S. J. Wolf & McNeill is raised to species rank as Polygonum hudsonianum (S. J. Wolf & McNeill) Hinds, and the new combinations Persi¬ caria bistortoides (Pursh) Hinds and Aconogonon alaskanum (W. Wight ex Hulten) var. glabrescens (Hulten) Hinds are made.