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Citation:
Flora of North America Editorial Committee, eds. 1993+ Flora of North America North of Mexico. 14+ vols. Oxford University Press, New York, NY.
New York Botanical Garden Press 1940 Mackenzie, K. K., North American Cariceae. Vol. 1 and 2.
Kentucky State Nature Preserves 2013
Smith, T. W. 2011 Flickr
Poindexter, D.B. 2013 Vascular flora of Alleghany County, North Carolina database. Appalachian State University, I.W. Carpenter, Jr. Herbarium, Boone, North Carolina 28608. [www.vascularflora.appstate.edu, accessed (06-01-2013)]
Global Biodiversity Information Facility 2012
Google Earth 2012