MANUAL OF THE GRASSES OF THE WEST INDIES 319 
LEEWARD IsLANps: Guadeloupe Duss 3190. St. Kitts, Box 313. 
WINDWARD Isuanps: Martinique, Hahn 1435; Duss 1312. 
5. Isachne rigens (Swartz) Trin., Gram. Pan. 252. 1826. 
Panicum rigens Swartz, Prodr. Veg. Ind. Occ. 23. 1788. Jamaica. 
Culms tufted, glabrous, slender, wiry, trailing, 1 to 2 m long, as 
much as 2 mm thick, the numerous flowering shoots curving upward, 
10 to 30 cm long; sheaths glabrous or puberulent, ciliate on the margin; 
ligule a ring of stiff hairs about 0.5 mm long; blades narrowly oblong- 
lanceolate 2 to 5 cm long, 2 to 5 mm wide, spreading, moderately, 
firm but not stiff and rigid, scabrous on both surfaces and on the 
cartilaginous margin; panicles ovoid or oblong, 2 to 5 cm long, the 
branches and branchlets stiffly ascending or spreading, the pedicels 1 
to 2mm long; spikelets 1.8 to 2mm long; glumes minutely hispidulous; 
rachilla between the two florets minutely villous; palea of upper 
floret sparsely appressed-hispidulous. 
Damp shady banks, Blue Mountains, Jamaica, at 1,000 to 2,000 
m altitude; Venezuela to Ecuador. 
Jamaica: St. Helens Gap, Mazon and Killip 614. Catherines 
Peak, Hitchcock 9732. Abbey Green, Hitchcock 9362; Harris 11585. 
Cinchona, Harris 11316, 11333, 11417, 11432, 12480; Mitchcock 9706 
(Amer. Gr.. Nat. Herb. 420), Sir Johns Peak, Harris 11595. Hard- 
ware Gap, Harris 11543. Clyde River, Harris 11445. Cold Spring 
Gap, Harris 11336, 12489. 
6. Isachne angustifolia Nash, Bull. Torrey Bot. Club 30: 377. 1903. 
Puerto Rico, Wilson 160. 
Culms clambering, as much as 2 m long and 2 mm thick, hard and 
wiry, with a long naked base, branching from the upper nodes, the 
branches long, leafy, nearly parallel, bearing secondary 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 
bushes; sheaths appressed papillose-pilose or roughened with papillae, 
or glabrous, the margin ciliate; ligule a ring of very short stiff hairs 
less than 0.5 mm long; blades narrowly lanceolate, 3 to 15 cm long, 
but mostly more than 5 cm long, 5 to 12 mm wide, rather firm and 
stiffly spreading, scaberulous or glabrate, papillose-ciliate at base or 
papillose only; panicles ellipsoid or oblong, as much as 15 cm long, 
the branches stiffly ascending or finally spreading, the branchlets and 
pedicels finally divaricate, these and the main axis scabrous; spikelets 
about 1.5 mm long; glumes minutely hispidulous toward the tip; 
florets and rachilla glabrous. 
Rocky slopes among brush, Puerto Rico and Leeward Islands. 
Purerto Rico: El Yunque, Wilson 160; Sintenis 1355. Sierra 
Loquillo, Hioram 369. Adjuntas, Sintenis 4045. Rio Icaco, Shafer 
3477. Utuado, Srntenis 6421. Monte Torrecilla, Britton, Cowell, and 
Brown 5595. Cayey, Chase 6750. Maricao, Britton and Cowell 4271; 
Britton, Stevens, and Hess 2566; Chase 6222. 
LEEWARD IsLANDs: Guadeloupe, Duss 2705. St. Kitts, Bor 146,314. 
7. Isachne arundinacea (Swartz) Griseb., Fl. Brit. W. Ind. 553. 1864. 
Panicum arundinaceum Swartz, Prodr. Veg. Ind. Occ. 24. 1788. 
Jamaica. 
Culms climbing among shrubs or small trees to a height of as much 
as 6m, as much as 5 mm thick at base, with strong canes and elongate 
60256—386——21 
