?Ann. Mus. Bot. Lugduno-Batavi 3: 119, 1867?. Submitted.

?Pflanzenr. (Engler) IV, 237: 190, 1905?. Submitted.

?Trudy Imp. S.-Peterburgsk. Bot. Sada 18: 429, 1901?. Submitted.

?Belgique Hort. 23: 971, 1873?. Submitted.