Verbatim text: Steyermark, J. A. 1934b. Studies in Grindelia. II. A monograph of the North American species of the genus Grindelia. Ann. Missouri Bot. Gard. 21: 433–608.
Author: Steyermark, J.A.
Year: 1934b
Title: Studies in Grindelia. II. A monograph of the North American species of the genus Grindelia
Journal: Ann. Missouri Bot. Gard
Volume: 21
Pages: 433–608
BHL link: http://www.biodiversitylibrary.org/part/16516