CYPERACEyE. 565 



f. 2. — C. hexastachyos, Rottb. (non Sw.) C. Hydra, V. C. pramorsus, Bockeler. C. spha- 

 celus, Sieb. Mixt. 359 (non Rottb.). C. olivaris, Turg.— fi"-12" (-1$') high i glumes 

 H'" long. — Hab. Jamaica !, Pd., Wils., March, a troublesome weed, said to be introduced ; 

 S. Kitts!, Els., Antigua!, Wullschl.; Trinidad!, Sieb.; [United States! to Guiana!, and 

 all tropical and warmer temperate countries of the old world]. 



18. C. esculentus, L. Rhizoma stoloniferous, bearing subglobose tubers ; stem 3- 

 angular, glabrous ; leaves flat ; clusters of spreading spikelets unequaily umbellate : involucre 

 3-5-leaved ; spikelets linear, pale-brown, or straw-coloured, many (-6) -flowered ; glumes 

 half -ovate-oblong, blunt, T-nerved, 3-4 times as long as the winged furrow, twice as long 

 as the obovate-oblong, 3-gonal achenium ; stamens 3. — C. aureus, Ten. C. repens, Ell. 

 C. phymatodes, Miihl. C. gracilescens, R. S. — 1'-2' high; glumes I'" long. — Hab. Ja- 

 maica!, March ; [all tropical countries to Italy !, the Cape, and United States!]. 



19. C. brunneus, Sw. Rhizoma short ; stem 3-angular, glabrous ; leaves flat, keeled, 

 glaucous ; clusters or spikes of many diverging spikelets in a simple, or compound, con- 

 tracted, or unequal umbel : involucre long, 3-6-leaved ; spikelets lanceolate-liuear, bicon- 

 vex, rusty-brown, 12-3-flowered ; glumes half-ovate, bluntish, 9-11-nerved, thrice as long 

 as the winged furrow, twice as long as the elliptical-oblong, 3-gonal achenium ; stamens 3. 

 — SI. t. 74. f. 2, 3 ?. — C. insignis, Kth. (ex Sieb. Trin. 7). C. purpurascens, V. .• a broad- 

 leaved form with compressed umbels. C. planifolius, Rich, (ex descr.). — l'-4' high; leaves 

 3"'-6'" broad ; glumes li'" long. — Hab. Jamaica!, Pd., on the sandy seacoast ; Antigua!, 

 Wullschl., Dominica!, Imr. ; Trinidad !, Sieb. ; [Cuba ! to Guadeloupe !]. 



20. C. sphacelatus, Rottb. Rhizoma short ; stem 3-angular, glabrous : one side 

 channelled below ; leaves flat ; clusters or spikes of spreading spikelets unequally umbellate : 

 involucre long, 3-6-leaved ; spikelets linear, tapering above, many-flowered, greenish, mostly 

 with an oblong, purple blotch along the margin ; glumes half -ovate-oblong , bluntish with a 

 minute point, 5-3-nerved, 4 times as long as the winged furrow, 2£ times as long as the 

 elliptical, 3-quetrous achenium ; stamens 3. — C. hexastachyos, Sw. (non Rottb.) C. Bal- 

 bisii, Klh.—S"-2' high ; glumes H'" long.— Hab. Jamaica !, A I., M'Nab ; S. Kitts !, Els., 

 a noxious weed, Antigua !, Wullschl., Dominica!, Imr. ; [Haiti to Brazil !]. 



21. C. distans, L., Sw. Rhizoma short ; stem 3-angular, glabrous ; leaves flat; spikes 

 of spreading spikelets in a large compound (or simple) umbel : involucre long, 8-5 -leaved ; 

 spikelets linear, 16-8 -flowered, brown, at length pale ; glumes distant, oblong, bluntish, 

 h-Z-nerved at the convex keel, at length spreading, twice as long as the winged furrow, 

 i as long again as the oblong-lanceolate, 3-gonal achenium ; stamens 3. — Rottb. Descr. t. 

 10.— C. elatus, Rottb.— Stout, H'-3' high ; glumes J"' long.— Hab. Antigua!, Wullschl.; 

 [S. Thomas to Brazil ; trop. Asia !, Australia, and Africa to the Cape]. 



Sect. 4. Diclidium, Schrad. — Spikelets sub cylindrical : glumes rounded on the back .- 

 rhachis jointed, its furrows deep, including or embracing the Z-angular achenium by its 

 persistent wing or margin. Style Z-cleft. 



* Spikelets in a single, lateral cluster. 



22. C. filiformis, Sw. Rhizoma short; stem slender, striate, 3-angular above, gla- 

 brous ; leaves setaceous-linear, or most abortive ; cluster single, exceeded by one, erect 

 leaf of the 3-1-leaved involucre; spikelets linear, flexuose, S-4-fowered, pale, or pale- 

 brown ; glumes oblong, bluntish, obsoletely many-nerved, twice as long as the furrow, half 

 as long again as the lanceolate-oblong, 3-gonal, dotted achenium : furrows convex on the 

 back; wings membranaceous; stamens 3. — C. havaneusis, W. — ^'-3' high; glumes l^'" 

 long. — Hab. Jamaica !, Pd., Al., March, Wullschl., on grassy hills ; [Cuba !, Haiti]. 



** Spikes of approximate spikelets, in a simple or compound umbel. 



23. C. odoratus, L. Rhizoma short ; stem . stout, 3-quetrous, glabrous ; leaves 

 broadly linear ; spikes in a compound umbel : involucre long, 6-12-leaved ; spikelets 

 linear, 12-7-flowered, pale ; glumes oblong-lanceolate, bluntish, striate, twice as long as 

 the furrow and as the lanceolate-oblong, convex-3-gonal, included achenium .- furrows 

 convex on the back : wings chartaccous • stamens 3. — SI. t. 74. / 1. — C. Sanctse Crucis, 

 Liebm. — 2' -several feet high; glumes 1 J'" long, 2 lowest empty ones broad at the base; 



