96 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
Hartt: Port-au-Prince, Kkman H 2019. 
LEEWARD IsLanps: Antigua, Box 38, 62. 
15. Aristida cognata Trin. and Rupr., Mem. Acad. St. Pétersb. VI. 
Sel. Natal: 27) W842.) St. homas: 
Culms ascending, 20 to 40 cm tail; blades involute, 5 to 15 cm long, 
about 1 mm wide; panicles narrow, loose, 5 to 15 cm long, the branches 
rather distant, ascending, mostly closely flowered, 1 to 2 ecm long; 
glumes acuminate, the first 4 to 5mm long, the second 1 to 2 mm 
longer; lemma 6 to 7 mm long, gradually narrowed into a scaberulous 
beak about 1 mm long; callus about 0.7 mm long, the hairs short and 
soft, awns about equal, ascending, 10 to 15 mm long. 
Dry hillsides, Virgin Islands and Montserrat. 
VirGin Isuanps: St. Thomas, Britton and Shafer 119; Rose 3189; 
Eggers in 1882. St. Croix, Benzon. 
St. John, Eggers 3003. 
WINDWARD IsLANDs: Montserrat, 
Shafer 48, 430. 
16. Aristida affinis (Schult.) Kunth, 
Rev. Gram. 1361 eas2or 
Chaetaria affinis Schult., Mant. 
2: 210. 1824. Pennsylvania. 
Aristida virgata var.? palustris 
Chapm., Fl. South. U.S. 555. 1860. 
Florida. 
Aristida palustris Vasey, Descr. 
Cat. Grasses U.S. 35. 1885. 
Culms tufted from a hard thick- 
ened base, stiffly erect, rather stout, 
1 to 1.5 m tall; panicle narrow and 
virgate, as much as 50 cm long; 
glumes about equal, mucronate, 
about 12 mm long; lemma about 8 
mm long, glabrous, the callus 1 mm 
long, short-pubescent; central awn 
horizontally spreading, 1.5 to 3 em 
long, the lateral erect, two-thirds 
to three-fourths as long (fig. 56). 
FIGURE 56.—Aristida affinis, X 1 (Combs 688). Low pine barrens, southern 
United States and Cuba. 
Cusa: Pinar del Rio, Ekman 17870. Remates, Ekman 11230. 
17. Aristida brittonorum Hitche., Contrib. U. S. Natl. Herb. 22: 584. 
1924. Isla de Pinos, Britton, Britton, and Wilson 14169. 
Culms rather stout, erect, 60 to 100 cm tall; blades firm, involute, 
stiffly erect, the basal as much as 30 cm long and 0.8 mm thick when 
rolled; panicles narrow, interrupted, 20 to 30 cm long, the branches 
appressed, the lower as much as 5 cm long; glumes acuminate, the 
first 7 to 10 mm long, the second 10 to 12 mm long; lemma about 7 
mm long, the sharp callus 1 mm long, the pubescence fine and short, 
the beak about 1 mm long; awns about equal, 1.5 to 2 cm long, widely 
spreading, all contorted at base. 
White sand in pineland, Isla de Pinos, Cuba. 
Cusa: Isla de Pinos, Britton, Britton, and Wilson 14169; Ekman 
11983, 12024, 12495. 
