ScLERiA. CLX. CYPERACEiE. 575 



* * Achenium rugose. 



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



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

 stem, cauliiie rising above the stem ; caryvibs 3 — 4, the terminal largest ; spike- 

 l-ets ovoid, in close fascicles of about 5 ; glumes 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, csespitose, striate; Ivs. setaceous, radical, 6 — 10" 

 long, cauline much shorter ; corpiibs diffuse, the lateral, if any, on short pedun- 

 cles ; spikelets ovoid, pedicellate or sessile ; glumes 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. CERATOSCHCENUS. Nees. 

 Gr. Kcpai, — aroi, a horn, tri^oji/of, 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 coinpound. 



1. C. LONGiROSTRis. A. Gr. (Schoenus 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 ; gluraes brown, ovate; bristles shortex 

 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; s^. 2— 3f high, triangular; Ivs. 1— 2f by 2—4", rough-edged; 

 axillary carymJ)s subsimple, terniinal ones compound ; upper spikelets densely 

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

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

 bins. ! 



16. C LABIUM. Browne. 

 Flowers J" 5 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 and axillary. 



C. MARisciilDEs. Torr. ^Schoenus. Muhl.) Bog Rush. 



St. terete, leafy, 20— 30' high, hard and rigid; lis. narrow! v linear, chan- 

 neled above, rounded beneath, much shorter than the stems ; brads short; uynbels 

 2 — 3, erect, the lateral on long ex.serted peduncles ; raus 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 (^, and the rest empty; 

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

 Penn. July. 



Tribr 3. SCI^EREiE. — Flowers monoecious or diclinous. Achenimn naked 



(witliout a perigynium), more or less hard and bony. 



17. SCLERIA. 



(ir. CKXrifioi, hard ; nlludinc to the iriduruted shell of the fruit. 



Flowers oiclinous, fertile spikelets 1 -flowered, glumes fasciculate; 

 ])erig3'nium cup-shaped or ; aclienium globose, ovoid or triangular, 

 with a thick, bony pericarp ; style S-clcft, deciduous —^1 Sfnns leafy. 

 Sjnkrlets in spikes, fasrirles or pa/iir/cs 

 49 ■ 



