POLYGONELLA BRACHYSTACHYA Meisn. in DC. Prodr. 14: So. 1856.
Polygonella Croomii Chapm. Fl. S. States, 387. IS6o.
As far as I can see, these two species must be united. Having the types of both at hand I cannot find any distinctive characters and in addition the labels show that Polygonella Croomii is from " South Florida," and not from " Carolina or Georgia," as Dr. Chapman records in the Flora of the Southern United States.