(B. ) Bitter, Bitter,, and Bitter, ?Repert. Spec. Nov. Regni Veg. 12: 445. 1913.?, 1913.

(B. ) Bitter and Bitter, ?Repert. Spec. Nov. Regni Veg. 11: 461. 1912.?, 1912.

Bitter and Bitter, (B. ), ?Repert. Spec. Nov. Regni Veg. 12: 147. 1913.?, 1913.

Bitter and Bitter, (B. ), ?Repert. Spec. Nov. Regni Veg. 12: 453. 1913.?, 1913.

(B. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 437. 1919.?, 1919.

(B. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 335. 1919.?, 1919.

(R. P. )& Bitter and Bitter, (B. ), ?Abh. Naturwiss. Vereine Bremen 24: 443. 1919.?, 1919.

(B. ) Bitter and Bitter, (V. ), ?Abh. Naturwiss. Vereine Bremen 24: 341. 1919.?, 1919.

(B. ) Bitter and Bitter, (V. H. M. A. )&, ?Abh. Naturwiss. Vereine Bremen 24: 358. 1919.?, 1919.

(B. ) Bitter, Bitter, (B. ), Bitter, (W. ), Bitter, (L. K. S. )&, Bitter, (B. ), Bitter, (B. S. )&, Bitter, (B. ), Bitter, (K. S. L. )&, Bitter, (B. ), Bitter, (B. ), Bitter, (W. ), and Bitter, (B. ), ?Abh. Naturwiss. Vereine Bremen 24: 504. 1919.?, 1919.

(B. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 503. 1919.?, 1919.