(f-I/O / Vol. 43, pp. 21-54 March 12, 1930 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHIN SEVENTH SUPPLEMENT TO THE FLORA OF THE DISTRICT OF COLUMBIA AND VICINITY. BY W. L. McATEE. This supplement contains not only a list of additions 1 to knowledge of the Flora of the District of Columbia and Vicinity since the last summary in Volume 21 of Contributions from the United States National Herbarium, but also the results of a recheck of all records in what may be termed the regular series of publications on our flora beginning with that of Ward in 1881 and extending to that of Hitchcock and Standley (and 20 collaborators) in 1919. This series comprises the following: Ward, Lester F., Guide to The Flora of Washington and Vicinity, Bui. 22, U. S. National Museum, 1881, 264 pp., 1 map. Ward, Lester F. List of plants added to the flora of Wash-ington from April 1, 1882, to April 1, 1884. Proc. Biol. Soc. Washington 2: 84-87. 1884. Knowlton, Frank H. Additions to the flora of Washington and vicinity from April 1, 1884, to April 1, 1886. Op. cit. 3: 106-132. 1886. Holm, Theodor. Third list of additions to the flora of Wash-ington, D. C. Op. cit. 7: 105-132. 1892. Holm, Theodor. Fourth list of additions to the flora of Washington, D. C. Op. cit. 10: 29-43. 1896. Holm, Theodor. Fifth list of additions to the flora of Wash-ington, D. C. Op. cit. 14: 7-22. 1901. Steele, Edward S. Sixth list of additions to the flora of Washington, D. C, and vicinity. With Descriptions of New Species and Varieties by Edward L. Greene, Alvah A. Eaton, and the author. Op. cit. 14: 47-86. 1901. i Literature reviewed through 1928, local records through 1929. 8— Proc. Biol. Soc. Wash., Vol. 43, 1930. (21)
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