580 CYPERACE^. 



costate with convex, distantly reticulated wrinkles. — Rhizoma fibrous, stoloniferous ; stem 

 glabrous, l'-4" high, exceeded by the leaves; leaves H'-5" long, about 2'" broad, striate, 

 keeled, glabrous, erect ; heads greenish, 6'" diam., often hemispherical : involucre foliaceous, 

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

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

 partial $ spikelets membranaceous, narrow, not keeled j uppermost ? convolute around the 

 ovary. — Hab. Trinidad !, Lockh. ; [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 scabx-ous epidermis seceding : disk flattish, 3-gonal. — Spikelets subglobose, most 

 in axillary, unequal, and proliferous umbels. 



103. O. angustifolia, Ns. Leaves narrowly linear, exceeding the stem ; umbels sub- 

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

 leaves 1'" broad ; achenium £'" diam., at length white : the seceding epidermis pale-brown. 

 — Hab. Trinidad!, Lockh., Cr., in woods; [Guiana, Equat. Brazil]. 



16. LAGENOCARPUS, Ns. 



Spikelets monoecious, $ compound, $ 1-flowered -. lower glumes empty. Style 3(2-3)-fid. 

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

 conical summit. — Perennials; stem few-leaved, rigid ; most leaves rosulate ; spikelets pani- 

 culate ; upper glumes in % approximate around the Z-5-lobed, disappearing disk, <J 1- 

 androus, 



104. L. tremulus, Ns. Leaves rigid, linear, channelled; spikelets of both sexes 

 mixed, or $ 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 -fid st vie deciduous. — 2'-4'high; leaves 3"'-4'" broad ; panicle narrow; spike- 

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



Tribe IV. CARICINEM. — Flowers unisexual, imbricated. Achenium included 

 within a tubular pal ea (the perigynium). 



17. CAREX, L. 



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

 the (J flowers. 



$ Spikelets androgynous, $ above. Style %-cleft. 



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

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

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

 with a short, 2-dentate beak, many-nerved, scabrous-pubescent, greenish, 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 (Sw.) ; [Cuba!]. 



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

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

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

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

 in the Blue Mountains : Al. (Sw.). 



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. 



