North American flora.

v. 22, pt. 2 (1963)

North American flora.

v. 22, pt. 3 (1908)

North American flora.

v. 22, pt. 4 (1908)

North American flora.

v. 22, pt. 5 (1963)

North American flora.

v. 29, pt. 1 (1914)

North American flora.

v. 29, pt. 2 (1938)

North American flora.

v. 21, pt. 3 (1918)