580 CYPERACE^. 



costate witli convex, distanily reticulated wrmito.— Rhizoina fibrous, stoloniferous ; stem 

 glabrous, l'-4" high, exceeded by the leaves; leaves IV-S" long, about 2'" broad, striate, 

 keeled, glabrous, erect ; beads greenish, 6'" diaiii., often hemispherical : involucre foMaceous, 

 3"'-leaved, unequal, spreading; spikelets 3'" long; glumes oblong-lanceolate, cynibiform 

 with the winged keel excurrent into the spreading-recnrved point : several and those of the 

 jartial $ spikelets membranaceous, narrow, not keeled ; uppermost ? convolute around the 

 ovary. — Hab. Trinidad I, Lochh. ; [Guiana !, in wet savannahs and woods : Kegel, 1116, 

 1117: Isolepis echinulata ?]. 



15. CALYPTROCARYA, Ns. 



Spikelets androgynous, compound ; partial inferior <? , superior 1-flowered, ? . Lower 

 glumes empty, superior in $ approximate around the flower and supporting besides 3 abor- 

 tive partial spikelets, which are inserted below the disk. Style 2-fid. Achenium chartaceous, 

 with the scabrous epidermis seceding : disk fiattish, 3-gonal. — Spikelets subglobose, most 

 in axillary, iinequal, and proliferous umbels^ 



103. C. ang^stifolia, JVi. Leaves narrowly linear, exceeding the stem ; umbels sub- 

 sessile : pedicels flexnose ; achenium ovoid-globose, bluntly mucronate. — Stem glabrous ; 

 leaves \™ broad ; achenium i'" diam., at length white ; the seceding epidermis pale-browu. 

 -t-Hab. Trinidad!, Lochh., Cr., in woods; [Gruiana, Eqnat. Brazil] . 



16. lAGENOCARPUS, Ns. 



Spikelets monoecious, (? compound, ? 1-flowered : lower glumes empty. Style 3(2-3)-fiJ. 

 -Achenium coriaceous, devoid of a hardened disk, produced above its cavity into a corky, 

 conical summit. — Perennials; st&m few-leaved, rigid; most leaves rosvlate ; spikelets pa»j- 

 tiilate ; upper glumes in ? approximate around the S-5-lo6ed, disappearing disk, 3 \- 

 androus. 



104. Ii. tremulus, iVi. Leaves rigid, linear, channelled; spikelets of both sexes 

 mixed, or J superior, clustered, or unequally fascicled along the half-whorled peduncles : 

 half-whorls distant on the common axis ; glumes brown, common ones awned, or mucro- 

 nate ; achenium brown, smooth, 3-striate below the middle, ellipsoidal-oblong : upper part- 

 hollow, as long as the fertile cavity, separated from it by a diaphragma : apex minutely 

 truncate: 3-iid style deciduous. — 2'-4'high; leaves 3'"— 1"' broad; panicle narrow; spike- 

 lets 14"'-2"' long.— Hab. Trinidad !, Or.; [Guiana!]. 



Tbibe IV. CARICIKEM. — Flowers unisexual, imbricated. Achenium included 

 within a tubular palea (the perigyniumj . 



17. CAREX, L. 



Perigynium 2-keeled, contracted at the summit, persistent around the achenium, none in 

 the i flowers. 



§ Spikelets androgynous, $ above. Style %-eleft. 



105. C. scabrella, Wahl. Csespitose, flaccid, glaucous ; spikelets few, ovoid, lateral 

 much exceeded by the foliaceous bract, ujipermost 1-2, second sessile, inferior distant, pe- 

 duneled ; glumes lax, brown with a green midrib, subulate ; perigynium ellipsoidal, pointed 

 with a short, 2-dentate beak, mSny-nerved, scabrous-pubescent, gieenish, half as long again 

 as the glume. — ^Wahlenberg's incomplete description does not agree in the leaves said to be 

 " very narrow." — Less than 1' high, exceeded by the flattish, 1'" broad leaves ; spikelets 

 about 3'" long.— Hab. Jamaica!, in mountains (Sio.) ; [Cuba !]. 



106. C. cladostachya, Wahl. Slender ; spikelets in distant, peduncled spikes : bracts 

 foliaceous ; glumes lax, rusty, ovate, mucronate ; "perigynium cuneate-oblong, with a 2- 

 denticulate beak; many-nerved, glabrous." — My specimen (1' high, flaccid, leaves scarcely 

 ]'" broad), being very young, is doubtful. " Spikes of 7-17 spikelets."— Hab. Jamaica !, 

 in the Blue Mountains : Al. {Sio.). 



y C. polystachya, Wahl., is said to be distinguished from C. cladostachya by numerous, 

 approximate spikelets and an erect stem : it was found in the same locality. 



