Bitter, Bitter,, and Bitter, (D. ), ?Repert. Spec. Nov. Regni Veg. 11: 354. 1912.?, 1912.

(D. ) Bitter and Bitter, ?Repert. Spec. Nov. Regni Veg. 11: 364. 1912.?, 1912.

(D. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 327. 1919.?, 1919.

Bitter and Bitter, (D. ), ?Abh. Naturwiss. Vereine Bremen 24: 326. 1919.?, 1919.

(D. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 483. 1919.?, 1919.

(D. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 481. 1919.?, 1919.