ScueRIa. CLX. CYPERACEA. 575 
* * Achenium rugose. 
7. R. cymMésa. Nutt. (Schenus. Willd.) : 
St. 1—2f high, triangular, angles acute; radical lvs. shorter than the 
stem, cauline rising above the stem; corymbs 3—4, the terminal largest; spuke- 
lets ovoid, in close fascicles of about 5; glwmes broad-ovate, dark brown; 
bristles 6, 3 as long as the broad-ovate, transversely rugose achenium ; tubercle 
depressed, much shorter than the ach_—N. J. toLa. Jl., Aug. 
8. R. Torreyana. A. Gr. | 2 
St. 2f high, slender, czspitose, striate; Jvs. setaceous, radical, 6—10 
long, cauline much shorter ; corymbs diffuse, the lateral, if any, on short pedun- 
cles; spikelets ovoid, pedicellate or sessile; glwmes 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. CERATOSCHG@NUS. Nees. 
Gr. ké0as,—aros, a horn, xotvos, rush; alluding to the long, persistent style of the achehium. 
Spikelets 2—5-flowered, one flower %, the rest &'; 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. tonctrostris, A. Gr. (Scheenus longirostris. Michx. S$. cornicula- 
tus. Lam. Rhyncospora cornic. A. Gr.)—Glabrous and glaucous; sé. 
3—4f high, triangular; lvs. 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; bristles 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. Macrostacuya. Torr. (Rhyncospora ejusd.) 
Glabrous; ‘st. 2—3f high, triangular; dvs. 1—2f by 2—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; siyle persistent, nearly 4 times as long as the achenium.—Mass, Rob- 
bins. ! 
16. CLADIUM. Browne. 
Flowers 3 & 2; glumes imbricated somewhat in 3 rows, lower 
ones empty ; bristles 0; stam. 2; style 2—3-cleft, deciduous; ache- 
nium subglobose, the pericarp hard, thickened and corky above.— 
U4 Stem leafy. Corymbs or panicles terminal and azillary. 
C. Mariscoipes. Torr. (Schenus. Mul.) Bog Rush. . 
St. terete, leafy, 20—30’ high, hard and rigid; /vs. narrowly linear, chan- 
neled above, rounded beneath, much shorter than the stems ; bracts short; wmbels 
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; glwmes 
tawny-brown, about 6, the upper usually $, the next (’, and the rest empty; 
ach. ovoid, short-beaked with the remains of the 3-cleft style—Bogs, Can. to 
Penn. July. 
Tre 3, SCLEREX.—F lowers monecious or diclinous. Achenium naked 
(without a perigynium), more or less hard and bony. 
17. SCLERIA. 
Gr. cxXnpos, hard; alluding to the indurated shell of the fruit. 
Flowers aiclinous, fertile spikelets 1-flowered, glumes fasciculate ; 
perigynium cup-shaped or 0; achenium globose, ovoid or triangular, 
with a thick, bony pericarp ; style 3-cleft, deciduous —% Stems leafy. 
Spikelets in spikes, fascicles or panicles. 
: 49 
