safford: chenopodium nuttalliae 521 



\'asey, Gpxjrge. Rare and ii.otcioorlfnj trees of Washin.</lon. Field & For. 1: 33- 



37. 1S75. 



Mentions about 252 species of ornamental trees native to the United States and a few foreign 



species. 

 Vasky, George. Oh three hybrid oaks near Washington, D. C. Bull. Torrey 



Club 10: 25-26. pis. 28-30. 1883. 

 Vasey, George. Notes on Cyperus refractus Eng. Bull. Torrey Club 10: 32. 



1883. 

 Vasey, George. Tuheriferous Hydrocotyle americana L. Bull. Torrey Club 



13:28-29. 1886. 

 Ward, Lester Frank. Sweet cicely as a bur. Bull. Torrey Club 11:92-93. 



1884. 

 Ward, Lester Frank. Frost plants. Science 23: 66. 1894. 



A note on Cunila. 



Ward, Lester Frank. Oaks of the Potomac side . Field & For. 1:39-42. 1875. 



Lists 11 species, 3 varieties, and 6 hybrids. 



Ward, Lester Fr.\nk. Conifers indigenous to the District. Field & For. 1: 54. 

 1875. 



Notes on Pinus rigida, 7nitis, inops, strobus, and Jimiperus lirginiana. 



Ward, Lester Frank. Tipularia discolor. Field & For. 2: 65-67. 1876. 

 Ward, Lester Frank. Guide to the flora of Washington, D. C, and vicinity. 

 Bull. U. S. Nat. Mus. 26: 1-264. "1881. (Map.) 



Checklist, p. 148-207. (Reprinted as Bull. 22, U. S. Nat. Mus.'! 1211 Phanerogama, 42 Ferns, etc. 

 98 Musci, 28 Hepaticae, 84 Algae. For six supplements see Ward, Knowlton, Holm, and Steele. 

 Ward, Lester Frank. Field and closet notes on th-; flora of Washington and 

 vicinity. Bull. Phil. Soc. Wash. 4:64-119. 1881. 



Practically the same as the introduction to his Guide to the Flora of Washington. 

 Ward, Lester Frank. List of plants added to the flora of Washington from April 

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



Forty-one additions and a few corrections. 



Ward, Lester Frank. Glimpses of the cosmos, 2:448-464. 1913. 



Contains a history of his Guide to the Flora of Washington. 



Warden, David Baillie. A chorographical and statistical description of the 

 District of Columbia, vii, 212 p. Washington, 1816. Florula columbiana, p. 

 191-209. 



Woolridge, John. Natural advantages of the City of Washington, D. C. p. 

 15-55, Dayton, Ohio. 1892. Advance sheets. 



Notes on the District of Columbia flora from L. F. Ward; Flora of Washington and vicinity are 

 included on p. .50-55. 



BOTANY. — Chenopodium nuttalliae, a food plant of the Aztecs. 

 W. E. Safford, Bureau of Plant Industry. 



In connection with his study of the economic plants of Mexico 

 the writer has come upon a Chenopodium eaten in the form of a 

 vegetable by the ancient Mexicans, but hitherto unknown to 

 botanists, and incorrectly referred by several Mexican writers 

 to the European Chenopodium bonus-henricus L., to which it 

 bears httle resemblance. The material from which this species 

 is here described was received by the writer from the well- 

 known archeologist and ethnologist, Mrs. Zelia Nuttall, of 

 Casa Alvarado, Coyoacan, near the city of Mexico, who col- 

 lected it in response to a request for the seeds of "huauhth." 



Instead of Amaranthus seeds, which he had expected, the 

 writer received the seeds and inflorescence heads of a Cheno- 



