Ferreyra, ?Publ. Mus. Hist. Nat. "Javier Prado", Ser. B, Bot. no. 12: 1, tab. 1. 1960?, 1960.

Ferreyra, ?Publ. Mus. Hist. Nat. "Javier Prado", Ser. B, Bot. no. 12: 3, tab. 2. 1960?, 1960.