B. & Dammer, ?Repert. Spec. Nov. Regni Veg., Beih. 16: 40. 1923.?, 1923.

B. & Dammer, ?Bot. Jahrb. Syst. 54: 502. 1917.?, 1917.

B. & Dammer, ?Bot. Jahrb. Syst. 54: 456. 1917.?, 1917.

B. & Dammer, ?Repert. Spec. Nov. Regni Veg. 13: 92. 1914.?, 1914.

B. & Dammer, ?Repert. Spec. Nov. Regni Veg. 17: 342. 1921?, 1921.