CYPERACE/E. 563 



Pd., in wet places ; Dominica!, Imr.; Triuidad!, Sch., Lockh. ; [southern Uuited States! 

 to Brazil ! ; trop. Africa ! aud Asia !]. 



5. O. acuminatus, Tour. Annual ; stem low, 3-angular, glabrous ; clusters single or 

 several : involucre long, 3-4-leaved ; spikelets ovate or oblong, bluntish, -pale, many-12- 

 ilowered ; glumes ovate-lanceolale, acute with the short point slightly spreading or re- 

 curved, \-'&-nerved at the keel, approximate, twice as long as the elliptical, compressed-3- 

 angular, pointed acheuium : furrows narrowly winged - , stamen 1. — S"-8"(-12") high: the 

 stem often only as long as the involucre; leaves flat; glumes f" long. — Hab. Jamaica!, 

 M'Nab; [Illinois! to Cuba!]. 



6. C. tenuis, Sw. Annual ; stem slender or low, filiform, glabrous ; clusters single or 

 several: involucre of 3 (-6) setaceous-linear leaves; spikelets linear, at length reflexed, 

 brown, 6-4-Jlowered ; glumes half -ovate, pointed with the short point slightly spreading, 

 9-7 -nerved, about twice as long as the winged furrow, half as long again as the obliquely 

 elliptical, 3-gonal, slightly dotted acheuium ; stamens 3-2. — 4"-8" (2"-12''j high; leaves 

 setaceous-linear, csespitose ; glumes i"' long. — Hab. Jamaica !, Pd., March, in wet places 

 Westmoreland. 



** Perennial species. 



+ Furrows wingless or narrowly winged. 



7. C. confertus, Sw. ! Rhizoma short ; stem obtuse-angled below, glabrous, about as 

 long as the leaves ; clusters unequally umbellate, rarely single : involucre long, 3-6-leaved ; 

 spikelets oblong, greenish or greenish-brown, 18— 4-flowered; glumes spreading, elliptical- 

 lanceolate, recurved acuminate, 11-7 -nerved, 6-4 times as long as the naked furrow, twice 

 as long as the elliptical-oblong, 3-quetrous, pointed achenium ; stamens 3. — Habit of C. com- 

 pressus, L., but stouter, l'-2' high ; leaves narrow, usually channelled ; glumes variable in 

 size, li'"-2'" long. — Hab. Jamaica !, Sw., AL, March, in wet pastures ; Antigua !, 

 Wullschl., [S. Croix ! ; Venezeula]. 



8. C. ochraceus, V. Rhizoma short ; stem 3-angular, glabrous ; clusters unequally 

 umbellate, (or " single ") : involucre long, 5-9-leaved ; spikelets oblong, bluntish, yellowish, 

 iiiany-8 -flowered ; glumes spreading, subulate with a bluntish, incur ved-erect point, auricled 

 at the base, obscurely Z-\-nerved, 4 times as long as the naked furrow, half as long again 

 as the elliptical, obtuse-angled, pointed, dotted achenium; stamen 1. — SI. t. 75- f 1. — 

 C. etegatis, L. (nou V.), from Sloane's figure, while Linnaeus's description refers more to 

 the preceding. — 3-1' high, flat-leaved; glumes i' " long, at length dotted. — Hab. Jamaica!, 

 Pd., Al., M'Nab, Wils., in wet places ; Antigua!, Wullschl.; Triuidad !, Sch. ; [Cuba! to 

 French islands ! Galapagos!]. 



9. C. viscosus, AU. Rhizoma short; stem obtuse-angled below, scabrous, viscous; 

 leaves convolute-filiform ; clusters unequally umbellate : involucre long, 3-5-leaved ; spike- 

 lets ovate, blunt, greenish-brown, 12-4-flowered; glumes elliptical, mucronate with a short, 

 spreading point, 11-7 -nerved, approximate, twice as long as the obovate, 3-gonal, smooth 

 achenium: furrows naked; stamens 2. — Rottb. Descr. t. &.f. 4. — C. elegans, Rottb. — 

 3'-2' high; glumes 1'" long. — Hab. Jamaica!, Macf. ; Antigua!, Nichols, Wullschl.; 

 Dominica!, Imr. ; Trinidad!; [Cuba! to French islands!, Sieb. Mart. 12; Mexico to 

 Venezuela]. 



10. C. laxns, Lam. Rhizoma short ; stem 3-angular, glabrous ; leaves broadly linear, 

 flat ; clusters in a compound umbel : involucre long, 6--12-leaved ; spikelets oblong, bluntish, 

 greenish, or greenish-brown, 16-0 -flowered ; glumes roundish-elliptical, mucronate with a 

 greenish, spreading point, 5-7-nerved, with a broadly membranaceous margin, thrice as 

 long as the naked furrow, half as long again as the elliptical, 3-quetrous, smooth achenium; 

 stamens 3-2. — C. elegans, V., Mey. ! {non L.). — 3'-2' high ; leaves 4"'-2'" broad ; glumes 

 f" long.— Hab. Jamaica!, Al., M'Nab, Wullschl., March; Trinidad !, Sieb. Tr. 9; [Pa- 

 nama!, Venezuela!, Guiana!, Brazil]. 



11. C. simplex, Klh. Rhizoma short; stem 3-angular, glabrous, usually shorter than 

 or as long as the involucre; leaves flat ; clusters of 3-5 (-1) diverging spikelets in a 

 simple, lax umbel: involucre long, 5-12-leaved; spikelets oblong-linear, tapering above, 

 greenish-brown, many(-8-)flowered ; glumes oblong-lanceolate, acuminate with a bluntish, 

 erect point, 1-\\-nerved near the middle, 4 times as long as the narrowly winged furrow, 



