94 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
simple, 5 to 10 cm long, the spikelets nearly sessile; glumes nearly 
equal, 8 to 9 mm long, acute; lemma 5 to 6 mm long, the callus 0.5 mm 
long; awns about equal, 10 to 12 mm long, spreading but not curved 
or contorted at base (fig. 55). 
Dry hills and barrens, Cuba. 
Cupa: Las Posas “in cuabales”’, EHkman 12739. Guanabacoa, 
Ekman 10898, 10899; Hitchcock 498, 23231; Léon 873, 4645; Baker and 
Hasselbring 7211. San Miguel de los Bafios, Killip 13831, 13858, 
13889, 13902. Pastelillo, Ekman 15410. Santiago de Cuba, Ekman 
8953, 15628. Rio Seboruco to Falls of Rio Mayari, Shafer 3694. 
Holguin, Ekman 15738. Mayari, Hkman 15863. Without locality, 
Wright 736. 
12. Aristida portoricensis Pilger, in Urban, Symb. Antill. 4: 100. 
1903. Puerto Rico, Sintenis 77. 
Culms tufted, often in large bunches, slender, erect or spreading at 
base, 30 to 50 cm tall; blades involute, somewhat curved or flexuous, 
mostly 5 to 10 cm long, scarcely 1 mm thick when rolled; panicles 
narrow, loose, few-flowered, mostly 3 to 8 cm long, the few distant 
branches rather stiffly ascending, mostly floriferous from the base; 
glumes awn-pointed, the first about 7 mm long, the second about 10 
mm long; lemma 10 to 12 mm long including the 1 mm long callus and 
the 2 to 3 mm long slightly twisted scabrous neck; awns about equal, 
divergent or horizontally spreading, 2 to 3 cm long, slightly contorted 
at base. 
Stony or barren slopes, Puerto Rico. 
Purerto Rico: Mayaguez, Sintenis 77; Chase 6269, 6298, 6812; 
Britton, Cowell, and Brown 4361; Holm 40. 
13. Aristida chaseae Hitchc., Contrib. U. S. Natl. Herb. 22: 575. 
1924. Boqueron, Puerto Rico, Chase 6507. 
Culms few in a tuft, widely spreading, 50 to 60 cm long; blades 
involute, 10 to 15 cm long; panicles narrow, 10 to 15 cm long; glumes 
equal or somewhat unequal, 10 to 13 mm long, acuminate or awn- 
pointed; lemma about 12 mm long, narrowed at the summit but scarce- 
ly beaked, scaberulous on the upper half; callus 1 mm long, densely 
pilose, the upper hairs about 1 mm long; awns equal, somewhat 
divergent, flat at base, not contorted, about 2 cm long. 
Open stony hills, Puerto Rico, known only from the type collection. 
14. Aristida swartziana Steud., Syn. Pl. Glum. 1: 137. 1854. 
Jamaica. 
Culms tufted, with numerous erect innovations, 40 to 70 cm tall; 
blades involute; mostly erect, as much as 30 cm long, about 1 mm 
wide; panicles narrow, loose and interrupted, as much as 15 cm long, 
the branches ascending, 1 to 3 cm long, usually rather lax, several- 
flowered; first glume about 7 mm long, the second about 1 mm longer; 
lemma about as long as the second glume or a little longer; callus 0.5 
mm long, the pubescence short and soft; awns about equal, ascending 
or somewhat spreading, 15 to 25 mm long. 
Rocky savannas and open ground, Jamaica, Hispaniola, and Lee- 
ward Islands. Described by Swartz as A. adscensionis L. 
JAMAICA: New Forest, southern Manchester, Hitchcock 9845 
(Amer. Gr. Nat. Herb. 790). Lititz Savanna, Harris 12440. Health- 
shire Hills, Harris 9542. Gordon Town, Hart 864. 
