S.Knapp, S.Knapp,, and ex Walp., K., ?Repert. Bot. Syst. (Walpers) iii. 125 (1844-45).?.

Raf., ex Walp., K., and Lindl., (R. P. )&, ?Edwards's Bot. Reg. 30: sub t. 46. 1844?, 1844.