Cytotaxonomy of Helianthus ciliaris and related species of the Southwestern U. S. and Mexico
Tài liệu tham khảo
Heiser, C. B., Jr. &Smith, D. M. 1955. New chromosome numbers inHelianthus. Proc. Indiana Acad.64: 250–253.
Stebbins, G. L. 1950. Variation and Evolution in Plants. xx, 643 p. Columbia University Press, N. Y.
Watson, E. E. 1929. Contribution to a monograph of the genusHelianthus. Pap. Mich. Acad.9: 305–475.