This name is a synonym of Trematodon longicollis Michx..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35120231) with original publication details: Oefvers. Förh. Finska Vetensk.-Soc. 62A(9): 1 1921.
This name was in version 1 of The Plant List, record tro-35120231.