lb 



FLORA OF THE DISTRICT OF COLUMBIA AND 



VICINITY. 



By A. S. Hitchcock and Paul C. Standley. 



INTRODUCTION. 



For many years the botanists of Washington have had under 

 consideration the project of preparing a flora Oi' Washington to 

 replace the excellent work of Lester F. Ward, entitled "Guide to 

 the Flora of Washington and Vicinity," published in 1881 as Bulletin 

 26 of the United States National Museum. This work and other 

 papers relating to the local flora are reviewed interestingly by Mr. 

 P. L. Ricker in a recent paper summarizing botanical activity in the 

 District of Columbia.^ 



According to Mr. Ricker, the first list of the plants of our region 

 was included in the Florula Columbiensis.^ The second list was 

 compiled by John A. Brereton ^ and was based upon investigations 

 made from 1825 to 1830 by the Botanical Club of Washington. In 

 1876 the Potomac Side Naturalists' Club issued the Flora Colum- 

 biana * in Field and Forest. 



The best known account of our flora is that by Lester F. Ward,^ 

 mentioned above, usually known as Ward's Flora. There were six 

 supplements to this.^ In 1906 the names of the flowering plants 



^ A sketch of botanical activity in the District of Columbia. Journ. Washington 

 Acad. Sci. 8: 487, 516. 1918. 



2 Florula Columbiensis: or a list of plants found in the District of Columbia. Printed 

 for the Washington Botanical Society. 1819. 



^ Florae Columbianae prodromus. 1830. 



* Flora Columbiana. A catalogue of the plants growing without cultivation in the 

 District of Columbia. By Dr. George Vasey, Prof. J. W. Chickering, Dr. E. Foreman, 

 Prof. Wm. H. Seaman, and Mr. L. F. Ward, Committee of Potomac Side Naturalists'. 

 Club. Field & For. 1: 83-87. 1876. 2: 13-15; 31-33; 45-46; 61-84; 86-88; 103-105. 1876. 

 Includes 1,083 species. Addenda, op. cit. 3: 145-164. 1878. Includes 112 species. 



oBull. U. S. Nat. Mus. 26. Pp. 1-264, with map. 1881. 



' 1. Ward, Lester F. List of plants added to the flora of Washington from April 1, 

 1882, to April 1, 1884. Proc. Biol. Soc. Wasliington 2: 84-87. 1884. 



2. 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. 



3. Holm, Theodor. Third list of additions to the flora of Washington, D. C. Op. 

 cit. 7: 105-132. 1892. 



4. Holm, Theodor. Fourth list. Op. cit. 10: 29-43. 1896. 



5. Holm, Theodor. Fifth list. Op. cit. 14: 7-22. 1901. 



6. Steele, Edward S. Sixth list of additions to the flora of Washington, D. C; 

 and \dcinity. Op. cit. 14: 47-86. 1901. 



13 



