ScLERiA CLX. CYPERACE^. 575 



* * Achenium rugose. 



7. R. CYMOSA. Nutt. (Schcenus. Willi.) 



St. 1— 2f high, triangular, angles acute ; radical Ivs. shorter than the 

 stem, cauline rising above the stem ; canjmbs 3—4, the terminal largest ; spike- 

 lefs ovoid, in close fascicles of about 5 ; gliomes broad-ovate, dark brown ; 

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

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



8. R. ToRREYANA. A. Gr. 



SI. 2f high, slender, c;Espitose, striate ; Ivs. setaceous, radical, 6 — 10" 

 long, caullnc much shorter ; corymbs diffuse, the lateral, if any, on short pedun- 

 cles ; spikelets ovoid, pedicellate or sessile ; glumes ovate, mucronate, brown ; 

 bristles 6, scarcely halt as long as the oblong-ovate achenium ; tntherclc short, 

 nearly as broad at base as the achenium. — N. J. Torreij. JL, Aug. 



15. C ERATO SCHCENUS. Nees. 



Gr. Kcpai, — aroi, a horn, ct)(^oivos, rush ; alluding to the long, persistent style of the acheniiun. 



Spikelets 2 — 5-flowered, one flower $ , the rest 8^ ; 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. LONGiROSTRis. A. Gr. (SchcEnus longirostris. Michx. S. cornicula- 

 tus. Lam. Rhyncospora cornic. A. Gr.) — Glabrous and glaucous ; st. 



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

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

 fascicled in 4s or 5s on the long peduncles ; glumes brown, ovate ; dmi^es shorter 

 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. MACROSTACHYA. Torr. (Rhyncospora ejusd.) 



Glabrous; st. 2 — 3f high, triangular; Ivs. 1 — 2f by 3 — 4", 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- 

 bins. ! 



16. C LABIUM. Browne. 



Flowers (^59; 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 and axillary. 



C. MARiscoiDEs. Torr. (Schoemts. Muhl.) Bog Rush. 



St. terete, leafy, 20 — 30' high, hard and rigid ; ks. 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 §,'the next (J', and the rest empty; 

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

 Penn. July. 



Tribe 3. SCL/ERE^. — Flowers monoecious or diclinous. Achenium naked 



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



17. SCLERIA. 



Gr. OKXripoi, hard ; alluding to the indurated shell of the fruit. 



Flowers aiclinous, fertile spikelets I -flowered, glumes fasciculate; 

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

 with a thick, bony pericarp ; style 3-cleft; deciduous. — % Stems leafy. 

 Spikelets in spikes, fascicles or panicles. 

 49 



