The North American species of Stipa; Synopsis of the South American species of Stipa,
by A. S. Hitchcock.
- Washington, Govt. Print. Off., 1925.
- vii, 215-289, ix-xi p. pl. 50-52 on 2 l. 25 cm.
- Smithsonian Institution. United States National Museum. Contributions from the United States National Herbarium. v. 24, pt. 7 .