Authority: Barneby, Rupert C. & Krukoff, Boris A. 1971. Supplementary notes on American Menispermaceae. VIII. A generic survey of the American Tricilisisae and Anomospermeae. Mem. New York Bot. Gard. 22: 1-89.
Until staminate flowers of S. mathiasiana can be compared with those of S. sprucei, there will remain some doubt as to the status of this species, distinguished at present chiefly by the thickly coriaceous texture of the leaf-blades.