The grama grasses: Bouteloua and related genera,
by David Griffiths.
- Washington, Govt. print. off., 1912.
- viii, 343-428, ix-xi p. illus., pl. 67-83. 25 cm.
- Smithsonian institution. United States national museum. Contributions from the United States national museum herbarium. v. 14, pt. 3 .
"Bulletin of the United States national museum. Issued February 24, 1912."