HITCHCOCK AND CHASE—GRASSES OF THE WEST INDIES. 365 
Culms erect or ascending; spikelets sometimes approxi- 
mate but not crowded. 
Culms rigid and wiry, bearing fascicled branches; 
leaves commonly in pairs, the blades usually 
short and rigid 3. A. curtifolia. 
Culms not rigid, simple or sparingly branching, the 
branches not fascicled. 
Blades involute-setaceous, commonly clustered at 
the base___________________ 4, A. refracta. 
Blades flat, about 1 mm. wide, with a thick car- 
tilaginous marginal band____5. A. gyrans. 
1. Aristida adscensionis L. Sp. Pl. 82. 1753. 
Aristida humilis H. B. K. Nov. Gen. & Sp. 1: 121. 1816. 
Aristida bromoides H. B. K. Nov. Gen. & Sp, 1: 122. 1816. 
Aristida maritima Steud. Syn. Pl. Glum. 1: 187, 1854. 
A densely tufted glabrous annual, the slender wiry culms ascending or erect 
from a geniculate base, freely branching from the lower nodes, the narrow 
blades commonly involute, the nodding panicles about 10 to 15 cm. long, the 
slender branches short, appressed, or sometimes the lower 5 cm. or more long, 
spreading and flexuous, the spikelets short-pediceled, mostly clustered, the equal 
awns 12 to 20 cm. long. Extremely variable in appearance, ranging from dwarf 
plants with narrow compact panicles to larger plants, as much as 70 cm. tall, 
with flexuous panicles. 
Open dry ground and waste places, throughout the warmer parts of America 
and the Old World. Originally described from the island of Ascencion. 
Aristida humilis was described from Cuman&, Venezuela; Aristida bromoides 
from Ecuador, and Aristida maritima from Guadeloupe. This species has been 
commonly referred to A. dispersa Trin. & Rupr.’ and is one of the forms the 
authors unite under this name. Grisebach? refers this species to A. stricta 
Michx. 
Bahamas (Crooked Island, Long Cay, Long Island), Jamaica (in the vicinity 
of Kingston), Haiti, Santo Domingo, Porto Rico (along the southwestern coast 
and on Mona Island), St. Croix, St. Jan, Antigua, Montserrat, and Guadeloupe. 
2. Aristida cognata Trin. & Rupr. Mém. Acad. St. Pétersb. VI. Sci. Nat. 5': 127. 
1842. 
Aristida swartziana Steud. Syn. Pl. Glum. 1: 137. 1854. 
Culms tufted, slender, wiry, spreading, 15 to 30 cm. long, branching from the 
lower nodes; blades flat or involute, flexuous, densely scabrous and sparsely 
long-villous on the upper surface; panicles narrow, the short branches ascend- 
ing, the spikelets clustered. Resembligg short-awned specimens of A. adacen- 
sionis but usually taller and distinguishable by the perennial base. 
Stony ground, southern Jamaica, Porto Rico (Boqueron), St. Thomas, whence 
originally described, and St. Croix. Aristida swartziana was described from 
Jamaica. Grisebach’ refers this species to A. purpurascens Poir. 
8. Aristida curtifolia Hitchc. Contr. U. 8. Nat. Herb. 12: 235, 1909, 
Culms densely tufted, wiry, rigid, 30 to 50 cm. tall, with fascicled branches; 
alternate internodes commonly shortened, bringing the leaves together in pairs, 
the blades involute, rigid, mostly short and spreading; panicles few-flowered, 
3 to 10 cm. long, the awns about 12 mm. long. 
*Mém. Acad. St. Pétersb. VI. Sci. Nat. 5': 129. 1842, 
“Fl. Brit. W. Ind. 534. 1864, 
