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Howard, R.A. Provided by Smithsonian Institution, Richard A. Howard Photograph Collection. United States, Massachusetts, Suffolk Co., Boston, Arnold Arboretum.
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W.D. Brush. Provided by National Agricultural Library. United States, Pennsylvania.
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W.D. Brush. Provided by National Agricultural Library. United States, Pennsylvania.
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W.D. Brush. Provided by National Agricultural Library. United States, Pennsylvania.
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P. Freeman Heim. Provided by National Agricultural Library. United States, Florida, Ocala National Forest.
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Bluford W. Muir. Provided by National Agricultural Library. United States, Minnesota.
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Leland J. Prater. Provided by National Agricultural Library. United States, Wisconsin, Nicolet National Forest.
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E.S. Shipp. Provided by National Agricultural Library. United States, Michigan.
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A.M. Sowder. Provided by National Agricultural Library. United States, District of Columbia, Washington.
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G.B. Sudworth. Provided by National Agricultural Library.
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Britton, N.L., and A. Brown. Provided by Kentucky Native Plant Society.
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Robert H. Mohlenbrock. USDA NRCS. Provided by USDA NRCS Wetland Science Institute (WSI).
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Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory. United States, Maryland, Prince George's Co., Lanham.
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W.D. Brush. Provided by National Agricultural Library. United States, Pennsylvania.
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W.D. Brush. Provided by National Agricultural Library. United States, Pennsylvania.
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W.D. Brush. Provided by National Agricultural Library. United States, Pennsylvania.
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W.D. Brush. Provided by National Agricultural Library. United States, Virginia.
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H.S. Graves. Provided by National Agricultural Library. United States, New Jersey, Burlington Co..
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C.R. Lockard. Provided by National Agricultural Library. United States, Massachusetts, Berkshire Co..
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W.H. Morin. Provided by National Agricultural Library. United States, Kentucky, Cumberland National Forest.
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J.P. Wentling. Provided by National Agricultural Library. United States, Massachusetts, Barnstable Co., Provincelands.
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J.P. Wentling. Provided by National Agricultural Library. United States, Massachusetts, Barnstable Co., Provincelands.
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O.M. Wood. Provided by National Agricultural Library. United States, New Jersey.
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Provided by National Agricultural Library. United States, Louisiana.