⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record kew-2574253, with some changes.

Polygonum watsonii Small is a synonym of Polygonum polygaloides subsp. confertiflorum (Nutt. ex Piper) J.C.Hickman

This name is a synonym of Polygonum polygaloides subsp. confertiflorum (Nutt. ex Piper) J.C.Hickman.

The record derives from WCSP (in review) which reports it as a synonym with original publication details: Mem. Dept. Bot. Columbia Coll. 1: 138 1895.

Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:291876-2.