Foto n. 7941 - spike bent (Agrostis exarata)
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 1: 204.
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Foto n. 66882 - spike bent (Agrostis exarata)
Steve Hurst - USDA-NRCS PLANTS Database - Not copyrighted image
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Foto n. 64962 - spike bent (Agrostis exarata)
Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. Washington, DC. - Non-Copyrighted Image
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Foto n. 64198 - spike bent (Agrostis exarata)
Robert H. Mohlenbrock USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. - Not copyrighted image
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