Coulter, J.M.; Rose, J.N. 1909. Supplement to the monograph of the North American Umbelliferae. Systematic Investigations and Bibliography. 12(10): 441-451.
Coulter, J.M.; Rose, J.N. 1909. Supplement to the monograph of the North American Umbelliferae. Systematic Investigations and Bibliography. 12(10): 441-451.