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Credit: Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 2: 497. | USDA | License: PD USDA

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Credit: Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. USDA Misc. Publ. No. 200. Washington, DC. 1950. | USDA | License: PD USDA

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Credit: Hitchcock, A.S. (rev. A. Chase) | http://plants.usda.g... | License: PD US Government PD USDA NRCS

Credit: Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 1: 174. | USDA | License: PD USDA

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