Natural History of District of Columbia — McAtee 21 



Hunter, W. 

 Botany of the Zoological Park. 

 Ann. Rep. Smiths. Inst. (1890), 1891, pp. 68-72. 

 About 350 species listed. 



Sudworth, Geo. B. 



Trees of Washington, D. C. (cover title). 



Arborescent Flora (native and cultivated) of Washington. 

 . Forestry Division, 1891. 16 pp., 2 maps. 



Lists separately and locates on maps the trees in the Department 

 of Agriculture and White House grounds, and in Lafayette Square. 

 Includes 324 species (exclusive of varieties), of which 90 (one doubt- 

 fully) are said to be indigenous to the District of Columbia. 



Holm, Theodor. 

 Third List of Additions to the Flora of Washington, D. C. 

 Proc. Biol. Soc. Wash., Vol. VII, pp. 105-132, June 10, 1892. 

 75 additional species besides 2 oak hybrids. 



Fourth List of Additions to the Flora of Washington, D. C. 

 Proc. Biol. Soc. Wash., Vol. X, pp. 29-43, Feb. 26, 1896. 

 28 additional species. 



Ridgway, Robert. 



Additional notes on the native trees of the lower Wabash Valley. 



Proc. U. S. Nat. Mus. 17, 1884, pp. 409-42, Pis. 10-15. 



This paper includes for comparative purposes a list of 28 species of 

 trees formed on a 200-acre farm near Falls Church, Va., and a list 

 of 47 species observed on a tract of 5 square miles near Laurel, Md. 

 (pp. 417-418). 



Greene, E. L. 

 Remarks on ascaulescent violets. 

 Pittonia, 3, pp. 139-145, Dec. 16, 1896. 

 I\otes on 6 species occurring about the District region. 



Studies in the Compositae, 2. Some northern species of An- 

 tennaria. 



Pittonia, 3, pp. 273-288, March 21, 1898. 

 Three species from vicinity of D. C. 



Critical notes on Antennaria. 

 Pittonia, 3. pp. 318-323, May 7. 1898. 

 Four species of D. C. region discussed. 



Two new Gerardias. 



Pittonia, 4, pp. 51-52, Pis. 9-10, April 11, 1899. 



From D. C. 



