62 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Santo Domingo: Barahona, Fuertes 1263. Constanza, Turckheim 3228. 



Pobto Rico : Santurce, Heller 1346. Catano, Millspaugh 163. Bayamon, Chase 

 6386. Rio Piedras, Stevenson 3498. Arecibo, Chase 6563. Cumuy, Chase 

 6566. Mayaguez, Chase 6281. Maricao, Chase 6242. Guanica, Britton, 

 Cowell & Brown 4911 ; Chase 6522. Penuelas, Britton, Britton & Marble 

 1758 ; Chase 6491. Aguirre, Underwood & Griggs 406. Guayania, Coll 511. 

 Cayo Muertos, Britton, Cowell & Brown 4981. Fajardo, Chase 6654. Vie- 

 ques, Chase 6668; Shafer 2470. Culebra, Britton & Wheeler 207. Mona 

 Island, Hess 441. 



Virgin Islands : St. Thomas, Britton, Britton & Shafer 127 ; Millspaugh 438. 

 St. Croix, Ricksecker 124, 443. St. Jan, Eggers 3299. Tortola, Britton & 

 Shafer 913 ; Fishlock 110. 



Leewabd Islands : Antigua, Rose, Fitch & Russell 3412 ; Wullschlaegel 633. 

 Guadeloupe, Duss 3173. Dominica, Jones 13. 



Windward Islands : Montserrat, Shafer 217. Martinique, Dwss 791. St. Lucia, 

 Moore 17. Grenada, Broadway 7015. 



Tbinidad: Port of Spain, Hitchcock 9996. Cedros, Hitchcock 10155. Chaca- 

 chacare, Hitchcock 10056, 10057. 



Tobago : Scarboro, Broadway 4726 ; Hitchcock 10209. 



Cubacao : Willemstad, Britton & Shafer 2916. 



Colombia : Barranquilla, Pittier 1558. 



Venezuela: Dos Caminos, Pittier 6307. Without locality, Fendler 1736. 



British Guiana : Upper Demerara River, Jenman 4011. f 



Bbazil: Campinos, Campos Novaes 1257. Minas Geraes, Widgren in 1845. SSo 

 Paulo, Lofgren & Edwald 2646 ; Gerdes in 1890. Lagoa Santa, Warming in 

 1863. Parana, Bustn 6652. Without locality, Glasiou 497, 1233, 6954; 

 Gardner 1190. 



Paraguay: Central Paraguay, Morong 96. 



Ubuguay : El Salto, Arechavaleta in 1893. 



Abgentina : Misiones, Ekman 670. 



7. Cenchrus insularis Scribn. 



Cenchrus insularis Scribn. in Millsp. Field Mus. Bot. 2 : 26. 1900. " Pajaros 

 Island, Alacran Shoals (1759). Type in Field Col. Mus. Herb. no. 61759." 

 Part of this specimen, collected by C. F. Millspaugh, is in the National Herba- 

 rium. 



DESCBIPTION. 



Plants annual, resembling a robust specimen of C. echinatus, the rather firm 

 blades scabrous on the upper surface, not pilose ; spikes 5 to 10 cm. long, not 

 very dense, the axis as in C. echinatus; burs globose, the body 9 to 11 cm. 

 high, minutely pubescent, the obconical base villous; bristles very numerous, 

 ascending, the outermost very slender, short, the inner successively broader 

 at base and longer, two rather well-defined series equaling or exceeding the 

 lobes of the body, conspicuously long-ciliate at the broad base ; lobes of the body 

 8 to 10, suberect, exceeding the spikelets, conspicuously long-ciliate except at 

 the sharp spinelike summits; spikelets 2 or 3, 6 to 7 mm. long, 2 to 2.2 mm. 

 wide; first glume narrow, usually obsolete; second glume very minutely puber- 

 ulent down the center or glabrous, two-thirds to three-fourths as long as the 

 equal sterile lemma and fruit, the base of the sterile lemma and upper part of 

 the palea minutely puberulent, the summit of the fertile lemma submembrana- 

 ceous, strongly nerved. 



