MANUAL OF THE GRASSES OF THE WEST INDIES 363 
St. Marc, Leonard 2969. Pétionville, Ekman H 2337. Miragoane, 
Eyerdam 568. Tortuga Island, Leonard 11519,15579. St. Michel de 
VAtalaye, Leonard 7461. Ennery, Leonard 8855. 
Dominican Repus.iic: Santo Domingo, Millspaugh 808. Azua, 
Rose 3948. Jaina, Faris 12, 108. San Juan, Ekman H 13617. 
Guayubin, Abbott 888. Without locality, Parry and Brummet 621. 
Purrto Rico: Juana Diaz, Sintenis 2904. Guanica Bay, Chase 
6517. Cayo Muertos, Brition, Cowell, and Brown 4986. Vieques 
Island, Chase 6667; Shafer 2653. Culebra Island, Millspaugh 619; 
Britton and Wheeler 122. 
VirGin Isuanps: St. Thomas, Hitchcock 16294. 
LEEWARD IsLaAnpDs: Guadeloupe, Duss 2718. 
WINDWARD IsuANnps: Martinique, Duss 790. 
Trinipap: Port-of-Spain, Hitchcock 9995. Palo Seco, Britton and 
Hazen 1164. Jawuba Ridge, Bot. Gard. Herb. 579. San Juan, 
Broadway 2609. Cedros, Broadway 4916. 
FIGURE 334.—Cenchrus echinatus. Bur, two views of spikelet, and floret, X 5 (Hitchcock 9379). 
5. Cenchrus echinatus L., Sp. Pl. 1050. 1753. Jamaica and 
Curagao. 
Culms ascending from a geniculate or decumbent base, often rooting 
at the lower nodes, branching from the base and usually from the 
lower nodes, commonly 25 to 60 cm long, sometimes as much as 1 m 
long; blades commonly 6 to 20 cm long and 3 to 8 mm wide; spikes 
finally rather long-exserted, 3 to 10 cm long (commonly not more 
than 7 cm long), not very dense; burs truncate at base, the body 4 to 7 
mm high, as broad or broader, pubescent, tawny or plumbeous, the 
outer bristles slender, the inner stout, broadened at base, the longest of 
them usually about equaling the lobes of the body, ascending or 
spreading, the lobes of the body commonly 10, erect or bent inward, the 
tips hard and spinelike, retrorsely barbed; spikelets about 4 (fig. 334). 
Open ground and waste places, a common weed throughout the 
erican Tropics at low and medium altitudes. To be found on 
probably all the West Indian islands. 
6. Cenchrus gracillimus Nash, Bull. Torrey Bot. Club 22: 299. 
1895. Florida. 
Plants perennial, at length forming dense clumps, glabrous as a 
whole; culms 20 to 80 cm tall, slender, wiry, erect or ascending; blades 
usually folded and stiffly flexuous, 5 to 20 cm long, usually 2 te 3 mm 
