A key to the genera of the Compositales of northeasten North America :
(based on vegetative and floral characters) /
by Richard A. Popham.

APA Citation

Popham, R. A. (Richard Allen)., Ohio State University. Department of Botany., Ohio Biological Survey. (1941). A key to the genera of the Compositales of northeasten North America: (based on vegetative and floral characters). Columbus: Ohio State University.

MLA Citation

Popham, Richard A. (Richard Allen), 1913-, Ohio State University. Department of Botany, and Ohio Biological Survey. A Key to the Genera of the Compositales of Northeasten North America: (based On Vegetative And Floral Characters). Columbus: Ohio State University, 1941.

Warning: These citations may not always be complete (especially for serials).