G.  Don, ?XXXIII Schweinitzia?, in A General History of the Dichlamydeous Plants, vol. 3, London: Gilbert and Rivington, 1834, p. 867.

T.  Nuttall, ?A description of some of the rarer or little known plants indigenous to the United States, from the dried specimens in the harbarium of the Academy of Natural Sciences in Philadelphia?, J. Acad. Nat. Sci. Philadelphia, vol. 7, pp. 61-115, 1834.