Andropogon saccharoides Swartz, the familiar silver beardgrass or silver bluestem, is a widely ranging polymorphic species. The interrelationships of the numerous named and unnamed varieties and forms of this species, and their relationships to Andropogon barbinodis Lag., A. altus Hitchc. and other species of this complex, have long been a perplexing problem to agrostologists.
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Gould, F. W.
"Andropogon saccharoides Swartz var. longipaniculatus var. nov.,"
Field and Laboratory: Vol. 23
Available at: https://scholar.smu.edu/fieldandlab/vol23/iss1/4