207 



lOOth Meridian, under C. Niittallii) ; Mexico, (Dr. Palmer, No. 

 49b, 1885); also in the West Indies, South America, eastern 

 India and Africa. 



* * Spikelets in dense terniinal clusters. 



13. C. aristatiis, Rottb. {C. injiexus, Muhl ; C. confertus, 

 Chapm., S. Flora, not of Swartz.) Throughout North Amer- 

 ica, but local. (E. Hall, PI. Oreg., 557, and PI. Tex., 677.) Dr. 

 Chapman's specimens from South Florida, marked C. confertus, 

 differ mainly in the reddish-brown glumes, which is the charac- 

 ter given by Clarke (1. c, p. 92), for his forma versicolor. The 

 species is widely distributed in temperate and tropical regions, 

 not, however, occurring in Europe. 



14. C. sesleroidcs, HBK. Sanoita Valley, southern Arizona, 

 (Rothrock, No. 614, P^xpl. and Surveys West of lOOth Meri- 

 dian) ; also in Mexico, Hartweg, No. 256 ; Liebmann ; Parry and 

 Palmer, Nos. 910, 911 and 911^; Chihuahua, Dr. E. Palmer, 

 No. 49^, 1885, named by me C. spectabilis^ which appears to be 

 a totally different plant. Specimens from various other Mexican 

 localities in the Gray Herbarium very closely resembling those 

 here cited are determined as C. divergens, HBK., which nearly 

 related, if not identical species Bceckeler and Clarke refer to 

 C. spectabilis, Schreb. • Following these authorities I was led into 

 error in my determination of Dr. Palmer's plant. 



Section 2. Conipressi, Kunth. 



15. C. conipressus, L. Maryland and southward along the 

 Atlantic and Gulf coasts to Texas (Curtiss, N. A. Plants, No. 

 3026; E. Hall, PI. Tex., 682); also in ballast at Camden and 

 Philadelphia ; Mexico and Central America and in the warmer 

 portions of Asia and Africa. 



16. C. Rnsbyi, Britton in Bull. Corn Bot. Club, xi., p. 29. 

 Near Silver City, New Mexico, Dr. H. H. Rusby, 1880. 



17. C. Buckley I, Britton. Valley of the Lower Rio Grande, 

 (Buckley); rocky hills near Chihuahua (Pringle, Plantae Mex., 

 1885, No. 311); Indian Terr. (E. Palmer, 347). 



18. C. Schzveinitzii, Torrey. Western Pennsylvania and 

 Canada to Texas and Arizona (Lemmon, No. 2905) ; westward 

 to the Pacific coast, extending north to Oregon (Geyer) ; also in 

 Mexico, (Parry and Palmer, 907). 



