ScLERiA. CLX. CYPERACEJE. 575 



* * Acheniwm rugose. 



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



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

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

 lets ovoid, in close fascicles of about 5; glumes broad-ovate, dark brown; 

 bristles 6, i 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. 



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

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

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

 bristles 6, scarcely half as long as the oblong-ovate achenium ; tubercle short, 

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



15. C ERATO SCHCENUS. Nees. 



Gr. Kcpai, — aroi, a horn, <7)(^oivos, rush ; alluding to the long, persistent style of the achenium. 



Spikelets 2 — 5-flowered, one flower $ , the rest c? ; 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. (Schoenus longirostris. Michx. S. comicula- 

 tus. Lam. Rh}Ticospora 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 ; ^^-^fes 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 2 — 4", rough-edged; 

 axillary corymbs subsimple, terminal ones compound ; upper spikelets densely 

 fascicled ; ack. 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 c? ? 9 j 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. MARiscolDES. Torr. ("Schoenus. MM.) Dog Rush. 

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

 leled above, rounded beneath, much shorter than the stems ; brads short; umbels 

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

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

 ?a\ray-brown, about 6, the upper usually 5> ti^s next (^, and the rest empty; 

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

 Penn. July. 



Tribe 3. SCIiEREiE. — Flowers moncEcious or diclinous. Achenium naked 

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



17. SCLERIA. 

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



Flowers aiclinous, fertile spikelets 1 -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 ' 



