@book{52785,
	author = {Swallen, Jason R.},
	title = {The awnless annual species of Muhlenbergia.},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1947.},
	series = {Smithsonian Institution.  United States National Museum. Contributions from the United States National Herbarium,},
	address = {Washington,}
}