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United States National Museum
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Herz, W.
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Kirby, G. W.
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Bajaj, Y. P. S.
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Culpeper, Nicholas, 1616-1654
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Ray, John, 1627-1705
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NetLibrary, Inc
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Gray, Asa, 1810-1888
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United States. Department of Agriculture
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United States. Department of Agriculture. Library
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United States. Forest Service
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Tamm, Ch
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New York Botanical Garden
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Dodoens, Rembert, 1517-1585
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Geological Survey (U.S.)
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Grisebach, H.
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Standley, Paul Carpenter, 1884-1963
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EBSCOhost
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Kole, Chittaranjan
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Linné, Carl von, 1707-1778
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Hooker, William Jackson, Sir, 1785-1865
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Moore, R. E.
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Tournefort, Joseph Pitton de, 1656-1708
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Esser, Karl
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Hooker, Joseph Dalton, 1817-1911
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Miller, Philip, 1691-1771
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United States. Agricultural Research Service
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ebrary, Inc
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Jackson, John F.
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Weber, William A. (William Alfred), 1918-
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Coulter, John Merle, 1851-1928
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Linskens, Hans Ferdinand
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Lüttge, Ulrich
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Merrill, Elmer D. (Elmer Drew), 1876-1956
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Millspaugh, Charles Frederick, 1854-1923
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Mohlenbrock, Robert H., 1931-
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Steglich, W.
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United States. Forest Service. Southern Research Station
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Behnke, H.-Dietmar
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Candolle, Augustin Pyramus de, 1778-1841
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Fosberg, F. Raymond (Francis Raymond), 1908-1993
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Jain, S. Mohan
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Missouri Botanical Garden
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Robbins, Wilfred William, 1884-1952
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