CYPERACE.E. 577 



hemispherical: involucre not ciliate at the subulate, white base, 5-7 (-3) -leaved; spikelels 

 white, ovate-obloug, bluntish; achenium obovate-roundish, truncate, obtusely margined, 

 delicately wrinkled transversely, twice as long and as broad as the compressed-conical, 

 pointed beak.- — SI. t. 7&.f. 1. — Schoenus, Lam. Dichromena leucocephala, Mich. — l'-l£' 

 high; spikelets 2"'-3"' long; achenium pale-brown, (dark-brown, when young): beak 

 greenish -brown, (pale, when young). — Hab. Jamaica !, Wullschl. ; [United States ! ; Cuba ! 

 to French islands !] . 



86. B. pura, Gr. Rhizoma creeping ; stem glabrous ; cluster ovate : involucre ciliate 

 at the base, long, 6-5-leaved ; spikelets white, oblong-lanceolate; acuminate ; achenium 

 obovate-roundish, margined, transversely wrinkled, 3-4 times as long and nearly as broad 

 as the compressed-conical, pointed beak. — Dichromena, Ns. — G"-12" high; involucre 

 whitish at the base chiefly within ; spikelets 3'" long ; achenium yellowish : beak rusty- 

 brown. — Hab. Antigua!, JFullschl., S. Vincent ; [Venezuela!, Guiana], 



87. R. Vahliana, Gr. Pilose with short down, (or stem glabrate) ; rhizoma " creep- 

 ing ;" cluster ovate-roundish, spreading : involucre ciliate at the base, 7-5-leaved ; spikelets 

 rvfescent, ovate-lanceolate, pointed ; achenium obovate-roundish, obtusely margined, trans- 

 versely wrinkled, twice as long and nearly as broad as the compressed-conical, pointed beak. 

 — Dichromena ciliata, V. — 1'-2' high, slender; involucre of the preceding; spikelets 3'" 

 long; achenium rusty-variegated: beak blackish. — Hab. Jamaica!,^?., Wils., common; 

 Trinidad!, Cr. ; [Southern United States to Brazil!]. 



88. R. Humboldtiana, Gr. Rhizoma fibrous ; stem glabrous ; cluster roundish, 

 spreading : involucre ciliate at the base, 3-5-leaved, nearly green ; spikelels white with 

 reddish lines, ovate-oblong, bluntish ; achenium margined, coarsely wrinkled, as broad as 

 the depressed, rounded beak. — Dichromena, Ns. D. pubera, V. — \'-2' high; spikelets 

 2'" long ; achenium rusty-greenish : flattish beak blackish. — Hab. Trinidad !, Sieb. Tr. 3 ; 

 [Mexico ! to Brazil ! ; Galapagos 1]. 



89. It. Fersooniana, Gr. Rhizoma "creeping;" stem glabrous; cluster roundish, 

 spreading : involucre ciliate, 5-6-leaved ; spikelets nfescent, ovate-lanceolate, pointed ; 

 achenium obovate-roundish, obtusely margined, delicately wrinkled transversely, 4 times 

 as long and nearly as broad as the compressed-conical, blunt beak. — Dichromena, Ns. 

 Schoenus ciliatus, Meg. Esseq. ! — 1'-2' high ; involucre little coloured at the base ; spikelets 

 2"'-3'" long; achenium yellowish, with approximate darker, flexuose streaks : beak blackish. 

 — Hab. Jamaica!, Wils.; [Cuba! and Mexico to Guiana!]. 



90. R. setigera, Gr. Glabrous ; rhizoma fascicled, filamentose at the summit ; stem 

 subcylindrical, rigid ; leaves convolute, rigid ; cluster dense, globose, emerging from the re- 

 curved, 2>-leaved, not ciliate involucre ; spikelets white, shortly oblong-lanceolate, acumi- 

 nate, few-flowered ; " achenium obovate-roundish, transversely wrinkled, twice as long and 

 as broad as the compressed-conical, bluntish beak." — Dichromena, Kth. ! — i'-l$' high 

 sp'ikelets 1£"' long. — Hab. Trinidad!, Lockh. ; [Brazil to Uruguay !]. 



Tkibe III. SCLERINEAH. — Flowers unisexual, imbricated. Achenium often bony, 

 supported by a disk. 



12. SCLERIA, Berg. 



Spikelets $ and ^ usually mixed, or androgynous, ? 1 (-2) -flowered : lower glumes empty. 

 Style %-fid. Achenium bony, supported by a hardened disk. — Perennials; stem S-angular, 

 leaved ; upper glumes in $ approximate around the disk, the latter usually Z-lobed. 



Sect. 1. Eusclebia. — Disk cupular, usually at length double with opposite lobes — Leaves 

 ligulate : ligule opposite to the blade. Spikelets paniculate, monoecious, (or partly andro- 

 gynous) : uppermost $ . 



* Panicle narrow, or virgate ; disk 3-lobed with the lobes entire, or truncate. 



91. S. pratensis, Lindl. Leaves broadly linear : sheaths and branches of the narrow 

 panicle narrowly ^-winged: ligule herbaceous, ovate-oblong, bluntish; <J glumes 1-androus ; 

 achenium depressed-globose, smooth, enamel-like-shining, with a papilliform point ; disk 

 broadly "A-lobed, interior adhering, exterior tardily separated.— Mart. Fl. Bras. 3. t. 23.— S. 



