Verbatim text: Nesom, G. L. 1989b. Comments on the annual species of Xanthocephalum (Compositae: Astereae) with a new combination. Phytologia 66: 482–487.
Author: Nesom, G.L.
Year: 1989b
Title: Comments on the annual species of Xanthocephalum (Compositae: Astereae) with a new combination
Journal: Phytologia
Volume: 66
Pages: 482–487
BHL link: http://www.biodiversitylibrary.org/part/9298