MANUAL OF THE GRASSES OF THE WEST INDIES 97 
18. Aristida calcicola Hitchc. and Ekman, N. Amer. Fl. 17: 405. 
1935. Cuba, Hkman 15774. 
Perennial; culms densely cespitose, erect, slender, wiry, glabrous, 
about 2-noded, sometimes branching, 30 to 50 cm tall; sheaths 
glabrous, pilose at the throat; ligule a ciliate membrane about 0.5 mm 
long; blades flat or mostly involute, glabrous beneath, scabrous- 
pubescent on the upper surface, usually 5 to 10 cm long, those of the 
culms often shorter, mostly less than 1 mm wide when flat; panicles 
narrow, 7 to 15 cm long, the few branches appressed, bearing 1 to few 
spikelets; glumes somewhat unequal, acuminate, about 1 cm long, the 
first 1 to 2 mm shorter than the second, glabrous except the keel of 
the first; lemma 8 to 10 mm long, slender, scabrous on the upper part, 
the callus rather slender, densely short-pilose, about 1 mm long; 
awns about equal, about equally divergent, 1.5 to 3 cm long, somewhat 
contorted at base. 
Limestone hillsides, Cuba and Hispaniola. 
Cusa: Guantanamo, Ekman 15774. | 
Dominican Repusuic: Monte Cristi, Ekman H13158. 
19. Aristida rosei Hitchc., Contrib. U.S. Natl. Herb. 22: 584. 1924. 
Dominican Republic, Rose, Fitch, and Russell 4027. 
Culms tufted, slender, wiry, often firm and stiff, erect, 30 to 80 
em tall; blades involute, ascending or spreading, from less than 5 em 
to more than 15 cm long; panicles narrow, rather lax, 5 to 20 cm long, 
the branches and peaicels delicate, appressed or ascending, few- 
flowered, the lower distant; the first glumes acuminate, mucronate, 
5 to 8 mm long, the second 1 to 2 mm longer; lemma 6 to 7 mm long, 
the callus 0.5 mm long, rather finely pubescent, the beak indistinct, 
about 1 mm long; awns about equal, divergent, only minutely 
scabrous, 1 to 1.5 em long, contorted at base. 
Dry or rocky slopes, Cuba and Hispaniola. 
Cusa: Pinar del Rio City, Ekman 17800. 
Haiti: Ennery, Leonard 8824, 8850; Ekman H 2454. Cabaret, 
Leonard 12108. Mdle-St.-Nicolas, Leonard 13215, 138313. Croix- 
des-Bouquets, Ekman H 2161, H 2316, H2316b. Gros-Morne, Ekman 
H4938. Habitation Prince, Picarda 1554. Port-au-Prince, Hkman 
H 2019, H 9281. 
Dominican ReEpusuic: Azua, Rose, Fitch, and Russell 4027. Santi- 
ago, Hkman H 15965. 
20. Aristida refracta Griseb., Cat. Pl. Cub. 228. 1866. Cuba, 
Wright 3431. 
Culms usually densely tufted with numerous innovations, erect, 
slender, 20 to 60 cm tall; blades filiform-involute, mostly less than 10 
cm long; sometimes as much as 20 cm long; panicles narrow, rather 
lax, 5 to 15 cm long, the branches ascending, at maturity rather stiff, 
few-flowered, sometimes as much as 3 cm long; glumes unequal or 
nearly equal, the second mucronate from a bifid apex; lemma about 
4.5 mm long, the callus 0.5 mm long, short-pilose, the summit scarcely 
beaked; awns about equal, or the lateral a little shorter, about 1 em 
long, contorted at base. 
Dry slopes and pine woods, Greater Antilles. 
Cupa: Pinar del Rio, Wright 3833, 3834; Hitchcock 23255, 23262. 
Guane, Léon 6942, 6971, 7307, 7308, 8971; Shafer 10414. Mantua, 
Shafer 11254. Laguna Jovero, Shafer 10718, 10864. Cajalbana, Léon 
