Natural History of District of Columbia — McAtee 23 



Greene, E. L. 



New species of Viola. 



Leaflets of Botanical Observation and Criticism, 1, pp. 214-219, 

 June 5, 1906. 



5 new species and 2 new varieties from the vicinity of Wash- 

 ington, D. C. 



House, H. D. 

 Violets of the District of Columbia. 

 Rhodora, Vol. 8, July, 1906, pp. 117-122, Pis. 71-72. 

 A list of 26 species and 19 hybrids. 



Ricker, P. L., Chairman of Seminar. 



A list of the Vascular Plants of the District of Columbia and 

 vicinity, prepared for the use of the Botanical Society of Washing- 

 ton, 133 pp., 1906. 



A typewritten working list containing 1,598 species exclusive of 

 hybrids and varieties. 



Tidestrom, Ivar. 



Eiysium Marianum. First ed. Pt. 1, Ferns and Fern allies, pp. 

 1-63, Pis. 1-8' (bis.), 1906. Second ed., Pt. 1, Ferns and Fern Allies, 

 pp. 1-63, Pis. 1-8 (bis.). Pt. 2, Evergreens, pp. 67-96, Pis. 10-12, 1908, 

 Pt. 3, Salicaceae, Ceriferae, Betulaceae, pp. 1-60, Pis. 1-14, 1910. 



Shreve, F., Chrysler, M. A., Blodgett, F. H., and Besley, F. W. 



The Plant Life of Maryland. 



Special Publ. Md. Weather Service, Vol. Ill, 533 pp., 38 Pis., 1910. 

 Contains many references to plants of the vicinity of the District of 

 Columbia. 



Tidestrom, Ivar. 



Notes on the flora of Maryland and Virginia. 



Khodora, 15, pp. 101-106, June, 1913. 



On 4 species of pines in the District flora. 



Greene, E. L. 



New species of Ranunculus. 



American Midland Nat., 3, No. 12, Nov., 1914, pp. 333-5. 



Four new species, 2 of them from this region. 



Violets of the District of Columbia, 1. 

 Cybele Columbiana, Vol. 1, No. 1, Dec, 1914, pp. 7-33. 

 An important discussion of the habitats and relationships of 

 numerous violets of this region. 



Bartlett, H H. 

 Twelve elementary species of Onagra. 



Cybele Columbiana, Vol. I, No. 1, Dec, 1914, pp. 37-56, Pis. 1-5. 

 Four new forms from Washington. 



