Verbatim text: Babcock, E. B. and G. L. Stebbins. 1937. The genus Youngia. Publ. Carnegie Inst. Wash. 484.
Author: Babcock, E.B., Stebbins, G.L.
Year: 1937
Title: The genus Youngia
Journal: Publ. Carnegie Inst. Wash
Volume: 484