Verbatim text: Nesom, G. L. 1993d. The genus Oreostemma (Asteraceae: Astereae). Phytologia 74: 305–316.
Author: Nesom, G.L.
Year: 1993d
Title: The genus Oreostemma (Asteraceae: Astereae)
Journal: Phytologia
Volume: 74
Pages: 305–316
BHL link: http://www.biodiversitylibrary.org/part/25893