HITCHCOCK AND CHASE—GRASSES OF THE WEST INDIES. 343 
Mountain meadows, Haiti, Santo Domingo (Rio Yaque), Saba, Guadeloupe, 
and Martinique. Originally described from Santo Domingo. 
5. Isachne angustifolia Nash, Bull. Torrey Club 80: 377. 1903. 
Culms often 2 meters long, hard and wiry with a long naked base, branching 
from the upper nodes, the branches long, leafy, nearly parallel, bearing sec- 
ondary branches toward the ends, the whole forming a wide flabellate or loosely 
corymbose mass, in its most characteristic development pushing through the 
jungle of stream bank or trail side and hanging over the bushes; blades firm, 
divergent, 5 to 12 cm. long, 5 to 10 mm. wide, paler beneath; panicles commonly 
10 to 12 em. long, about half as wide. 
Rocky slopes among brush, Porto Rico (at higher altitudes) and Guadeloupe. 
Type specimen Wilson 160, collected on the summit of El Yunque, Luquillo 
Mountains, Porto Rico. 
6. Isachne arundinacea (Swartz) Griseb. Fl. Brit. W. Ind. 553. 1864. 
Panicum arundinaceum Swartz, Prodr. Veg. Ind. Occ. 24. 1788. 
Isachne panicea Trin. Gram. Pan. 253. 1826. 
Climbing among shrubs or small trees to a height of as much as 6 meters, 
with strong canes and elongate branches; blades commonly 20 cm. long and 1.5 
to 2 cm. wide, scabrous; panicles about 12 cm, long, the long lower branches at 
first ascending, finally wide-spreading ; spikelets crowded toward the ends of the 
branches. 
Wooded hillsides, Jamaica at an altitude of 1,000 to 2,000 meters; also Mexico 
to northern South America, Originally described from Jamaica. 
7. Isachne disperma (Lam.) Doell in Mart. Fl. Bras. 27: 274. 1877. 
Panicum dispermum Lam. Tabl. Eneyel. 1: 173. 1791. 
Panicum multinerve Desv.; Poir. in Lam. Enecyel. Suppl. 4: 279. 1816. 
Isachne dubia Kunth, Rév. Gram, 1: 42. 1829, 
Similar to the preceding, the blades larger, smooth, the panicles larger, the 
spikelets scattered. 
Mountain woods, Lesser Antilles. Originally described from tropical America. 
There is nothing on the label of the type specimen to indicate its origin. Pani- 
cum multinerve is described from the Antilles. The label of the type specimen 
indicates that the plant came from Porto Rico. As the species has not since 
been collected upon that island, the locality may be doubted. 
St. Kitts, Guadeloupe, Dominica, Martinique, St. Vincent, Grenada, and 
Tobago. 
8. Isachne polygonoides (Lam.) Doell in Mart. Fl. Bras. 27: 273. 1877. 
Panicum polygonoides Lam. Encycl. 4: 742. 1798. 
Panicum trachyspermum Nees, Agrost. Bras, 212. 1829. 
Isachne trachysperma Nees in Seem. Bot. Voy. Herald 224, 1857, 
Flowering shoots 20 to 30 cm. tall, erect from a long creeping, freely branch- 
ing culm, rooting at the nodes, the whole plant often a meter in length, the erect 
shoots finally bearing fascicled branchlets, the sheaths hispid, the spreading 
lanceolate-ovate blades very scabrous; panicles included at base, about 5 cm. 
long and as broad, loosely many-flowered. 
Moist ground, Central America and Trinidad (Piareo Savanna) to Brazil. 
Originally described from Cayenne. Panicum trachyspermum was described 
from Brazil. 
43. OPLISMENUS Beauv. 
Inflorescence of several thick racemes along a common axis; spikelets sub- 
sessile; glumes and sterile lemma awned or mucronate; fruit as in Panicum, 
acute, 
