ScLEBiA. CLX. CYPEllACEiE. 575 



♦ ♦ Achcnium rugose. 



7. R. cYMosA. Nutt. (Schopnus. Will, I.) 



St. 1 — 21" high, triangular, angles arute; radical Ivs. shorter than the 

 stem, caulinc rising above the stem; citnjviljs 3—4, the terminal largest; spike- 

 lels ovoid, in close I'ascicles ol" about 5; illumes broad-ovate, dark brown; 

 bristles 6, J as long as the broad-ovate, transversely rugose achenium ; tubercle 

 depressed, much shorter than the ach. — N. J. to La. Jl., Aug. 



8. R. ToRRKVANA. A. Gr. 



St. 2f high, slender, cncspitose, striate; Ivs. setaceous, radical, 6 — 10" 

 long, caulinc much shorter; rorymbs diffuse, the lateral, if any, on short pedun- 

 cles; spikclcts ovoid, pedicellate or sessile; illumes ovate, mucronate, brown ; 

 bridles 6, scarcely halt' as long as the oblong-ovate achenium ; tubercle short, 

 nearly as broad at base as the achenium. — N. J. Torrey. Jl., Aug. 



15. CERATOSCHCENUS. Nees. 



Gr. Kcpag, — aroj, a horn, c^oivoi, rush ; alluding to the long, persistent style of the achenium. 



Spikelets 2 — 5-flowered, one flower $ , the rest d" ; glumes loosely 

 imbricated, somewhat in 2 rows, lower ones empty ; perig. of 5 or 6 

 rigid, hispid or scabrous bristles ; stam. 3 ; style simple, very long, 

 persistent on the smooth, compressed achenium. — % Stems leafy. 

 Corymbs compound. 



1. C. LONGIUO.STRIS, A. Gr. (Schoenus longirostris. MicLv. S. comicula- 

 tus. Lam. Rhyncospora cornic. A. Gr.) — Glabrous and glaucous ; 5^, 



3 — 4f high, triangular ; Ivs. 12 — 16' by 4 — 6", flat, rough-edged ; Jls. in very 

 large, terminal and axillary corymbs, terminal one the largest ; sjrikelets loosely 

 fascicled in 4s or 5s on the long peduncles ; glumes brown, ovate; bristles shoxlev 

 than the achenium, which is 2" long, and crowned with the (7") long, subu- 

 late, horny style. — Ohio ! to Flor. Common in wet places Aug. 



2. C. MACROSTAcnYA. Tom (Rhyncospora ejusd.) 



Glabrous; 5^. 2 — 3f high, triangular; Ivs. 1 — 2f by 2 — i", rough-edged; 

 axillary corymbs subsimple, terminal ones compound ; upper spikelets densely 

 fascicled ; ach. ovate, smooth ; bristles erectly hispid, twice as long as the ache- 

 nium ; style persistent, nearly 4 times as long as the achenium. — Mass. Rob- 

 bijis. ! 



16. CLADIUM. Browne. 



Flowers c^ ? 9 ; glumes imbricated somewhat in 3 rows, lower 

 ones empty ; bristles ; stam. 2 ; style 2 — 3-cleft, deciduous ; ache- 

 nium subglobose, the pericarp hard, thickened and corky above. — 

 % Stem leafy. Corymbs or panicles terminal ami axillary. 



C. MARiscoiDEs. Torr. TSchoenus. Mukl.) Bog Rusk. 



St. terete, leafy, 20 — 30' nigh, hard and rigid; Ivs. narrowly linear, chan- 

 neled above, rounded beneath, much shorter than the stems ; bracts short ; umbels 

 2 — 3, erect, the lateral on long exserted peduncles ; rays 3 — 7, some of them 

 very short; spikelets aggregated in heads of 4 — 8, lance-ovate, 3" long; glumes 

 tawny-brown, about 6, the upper usually 5, the next ^f, and the rest empty; 

 ach. ovoid, short-beaked with the remains of the 3-cleft style. — Bogs, Can. "to 

 Penn. July. 



Tribe 3. SCIiERE^E. — Flowers monoecious or diclinous. Achenium naked 



(without a perigynium), more or less hard and bony, 



17. SCLERIA. 



Gr. (tk\t)pos, hard; alluding to the iiuluro.ted shell of the fruit. 



Flowers aiclinous, fertile spikelets 1 -flowered, glumes fiisciculate ; 

 perigynium cup-shaped or ; achenium globose, ovoid or triangular, 

 with a thick, bony pericarp ; style 3-cleft, deciduous. — ^ Sfe?}is kafy. 

 Spikelets in- spikes., fascicles or panicles. 

 49 



