MANUAL OF THE GRASSES OF THE WEST INDIES 365 
8. Cenchrus pauciflorus Benth., Bot. Voy. Sulph. 56. 1840. Baja 
California. FIELD SANDBUR. 
Sometimes forming large mats; culms 20 to 90 cm long, rather 
stout, spreading to ascending from a decumbent base, usually freely 
branching; blades from flat to subinvolute or folded, 3 to 15 cm long, 
2 to 7 mm wide; spikes numerous, short-exserted or partly included, 
3 to 10 cm long; burs rather crowded (excluding the spines), 3 to 7 
mm wide (commonly 4 to 6 mm), pubescent, often densely so, rarely 
nearly glabrous; spines numerous, spreading or reflexed, flat, broad- 
ened at base, the lowermost shorter and relatively slender, some of 
the upper ones commonly 4 to 5 mm long, usually villous at the base; 
body of the bur often with one deep cleft on the outer face, the lobes 
commonly about 8, usually villous at the base, rigid and spinelike; 
spikelets usually 2 (fig. 337). 
This is the species to which the name Cenchrus tribuloides was 
commonly applied until 1908 when it was shown ™ that this name 
FIGURE 337.—Cenchrus pauciflorus. Bur, two views of spikelet, and floret, X 5 (Hitchcock 13582). 
should apply to the large-burred coastal plant which had been 
distinguished as C. macrocephalus. The name C. carolinianus Walt. 
was then applied to this species, but Walter’s diagnosis does not 
agree with its characters and it haS not been found in Walter’s 
region. 
Sandy open ground, United States, Mexico, and the West Indies 
to Argentina. 
Bauwamas: Nassau, Geogr. Soc. Baltimore 101. 
Cusa: Laguna Santa Barbara, Ekman 18102a, Sdbbalo, Ekman 
11446. Vicinity of Habana, Hitchcock 492, 493, 23445; Léon 188%, 
836, 2391, 3445, 3453; Ekman 799; Palmer and Riley 1146. Bahia 
de Manati, Léon 15755, 16026. Without locality, Wright 3476. 
Jamaica: Black River, Hitchcock 9637. Pigeon Island, Maron and 
Killip 1569. 
Hartt: Gonaive Island, Leonard 3050. Tortuga Island, Leonard 
13898, 15330; Ekman H 4160. 
Dominican Repusuic: Higiiey, Ekman H 12228. Los Siete Her- 
manos, Hkman H 13167. 
Purrto Rico: Santurce, Chase 6345}. 
% Contrib. U. S. Natl. Herb. 12: 127. 1908. 
