HITCHCOCK GRASSES OF CUBA. 231 



in the herbarium of the New York Botanical Garden: Santiago de Cuba, Taylor 232; 

 Madruga, Shafer 453; Matanzas, Britton & Wilson 29. 



In the Grisebach Herbarium are two Wright specimens of this species, "Savannas 

 of Guanacaro, July 28," no. 287 of 1865, and no. 3474 of 1860 to 1864. 



4. Chaetochloa purpurascens (H. B. K.) Scribn. & Merr. U. S. Dept. Agr. Div 



Agrost. Bull. 21: 13. 1900. 

 Setaria purpurascens H. B. K. Nov. Gen. & Sp. 1: 110. 1816. 

 Batabano, Shafer 487; Jaguey, Eggers 5320 in Herb. N. Y. Bot. Gard. 



5. Chaetochloa setosa (Sw.) Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 4: 39. 



1897. 

 Panicum setosum Sw. Prod. 22. 1788. 



Isle of Pines, Palmer & Riley 1000 in Herb. N. Y. Bot. Gard.; Santiago de Cuba, 

 Taylor 13, 71; Matanzas, Rugel 880. 



6. Chaetochloa verticillata (L.) Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 



4: 39. 1897. 

 Panicum verticillatum L. Sp. PI. ed. 2. 82. 1762. 

 Habana, Curtiss 693, Hitchcock in 1906, Baker, HC 2675, Leon 555. 

 A weed in the Botanical Garden . 



37. CENCHEUS L. Sp. PI. 1049. 1753. 



Blades crowded, short, stiff, conspicuously distichous 2. C. distichophyllus. 



Blades not crowded, stiff, nor distichous. 



Basal bristles of bm. stout 1. C. carolinianus. 



Basal bristles of burs numerous, slender. 



Burs 12 mm. or more wide, lobes erect 3. C. echinatus. 



Burs not over 8 mm. wide, lobes interlocking 4. C. viridis. 



1. Cenchrus carolinianus Walt. Fl. Car. 79. 1788. 



Cenchrus tribuloides L. err. det. Griseb. Fl. Brit. W. Ind. 556. 1864. 

 Cojimar, Hitchcock in 1906; Triscornia, Hitchcock in 1906; Guanajay, Palmer & 

 Riley 781; Habana, Palmer & Riley 1146; Wright 3476 in Gray Herbarium. 



2. Cenchrus distichophyllus Griseb. Cat, PI. Cub. 234. 1866. 

 Wright 3475. 



The Grisebach specimen, which is the type of this species, is from western Cuba, 

 1863, numbered "916=3475." Wright's 3475 in the Gray Herbarium is from ' ' Pinales, 

 Guanes, Remates, Dec." 



3. Cenchrus echinatus L. Sp. PI. 1050. 1753. 



Santiago de las Vegas, Hitchcock in 1906; Guanajay, Palmer & Riley 679; Isle of 

 Pines, Taylor 24; Santiago de Cuba, Taylor 24 in Herb. N. Y. Bot. Gard. 



4. Cenchrus viridis Spreng. Syst. 1: 301. 1825. 



Wright 3889; Guanajay, Palmer & Riley 665; Santiago de Cuba, Millspaugh 1110, 

 Pollard, Palmer & Palmer 284; Wright 3476 in Grisebach Herbarium; Cienfuegos, 

 Combs 597 in Gray Herbarium. The following are in the herbarium of the New York 

 Botanical Garden: Matanzas, Britton & Shafer 127; Santiago de Cuba, Under uood & 

 Earle 168. Wright 3889 is listed in Sauvalle's Flora Cubana as "Andropogon Sp.?" 

 It would seem that there must be some error in numbering, but this number in the 

 Gray Herbarium is also Cenchrus. 



Cenchrus viridis may be distinguished from C. echinatus by the smaller burs and 

 more incurved involucre lobes. 



