----. 1935. Collecting grasses in northeastern Brazil. Ed. Smithsonian Institution
Hitchcock, AC; JR Swallen; A Chase. 1939. Poales poaceae: [pars]. Ed. The New York Bot. Garden. North american flora v.17, 8.
Swallen, JR. 1943. Flora of Panama: Gramineae. Ed. Missouri Botanical Garden
----. 1950. A new species of Leptoloma from Texas (Contributions from the Texas Research Foundation). Ed. Texas Research Foundation
----. 1950. Some introduced forage grasses of the genus Andropogon & related species (Contributions from the Texas Research Foundation). Texas Research Foundation. 19 pp.
----.1955. Flora of Guatemala: Part II: grasses of Guatemala. Fieldiana: Botany 24, pt. II
Libros
Swallen, JR. 1955. Flora Of Guatemala: Part II: Grasses Of Guatemala Fieldiana: Botany 24, parte II. ix + 390 pp. ISBN B0007ESXF8
Swallen, JR. 1950. New grasses from Mexico, Central America & Surinam (Contributions from the United States National Herbarium). Ed. U.S. Govt. Print. Off. 428 pp.
----. 1948. New grasses from Honduras, Columbia, Venezuela, Ecuador, Bolivia, & Brazil (Contributions from the United States National Herbarium). Ed. U.S. Govt. Print. Off. 276 pp.
----. 1947. The awnless annual species of Muhlenbergia (Contributions from the United States National Herbarium). Ed. U.S. Govt. Print. Off. 208 pp.