746 Order 155.— CYPERACELE. 



than the achenium, which is 2" long, and crowned with tho (7") long, subulate, 

 horny style. — Ohio to Fla. Common in wet places. Aug. Rhynccspora cor- 

 uiculata Gray.) 

 2 C. macrostachya Torr. Glabrous; culm 2 — 3f high, trianguhr; lvs. 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 achenium ; stylo persistent, nearly 4 times as long as the ache- 

 nium. — Mass. (Robbins). (Rhyucospora ejusd.) 



16. CLA^DIUM, Browne. Flowers $ $ $ ; glumes imbricated some- 

 what in 3 rows, lower ones empty ; bristles ; stain. 2 ; style 2 — 3- 

 cleft, deciduous ; achenium subglobous, the pericarp hard, thickened 

 and corky above. — U Stem leafy. Corymbs or panicles terminal and 

 axillary. 



1 C. mariscolde3 Torr. Bog Rush. St terete, leafy, 20 — 30' high, hard and 

 rigid ; Ivs. narrowly linear, channeled above, rounded beneath, much shorter than 

 the stems; bracts short; umbels 2 — 3, erect, the lateral on long, exserted pedun- 

 cles ; rays 3 — 7, some of them very short ; spikes aggregated in heads of 4 — 8, 

 kmce-ovate, 3'' long; glumes tawny-brown, about 6, tho upper usually $ , tho 

 next $ , and the rest empty ; ach. ovoid, short-beaked with the remains of the 3- 

 cleft style. — Bogs, Can. to Penn. July. (Schoenus, Muhl.) 



2 C. effusum Torr. Saw-grass. Culm obtusely 3 -angled, 6 to 1 Of high; lvs. 5 

 to lOfl long, 4 to 10" wide, tapering to a very long, 3-angled point, margin* 

 sharply serrate-barbed ; corymbs numerous, decompound, diffuse, approximated 

 and forming a large, elongated panicle; spikes 2" long, 3 or 4 together, brown; 

 ach. ovoid, 1 ' long. — Ponds and swamps, N. Car. to La. (Hale). A coarso anci 

 rank sedge. 



M. SCLE'RIA, L. Nut Sedge. (Gr. onXripoc;, hard ; alluding- to 

 the indurated shell of tho fruit.) Powers 8 , staminate spikes inter- 

 mixed, fertile spikelets 1-flowered, glumes fasciculate ; perigynium cup- 

 shaped or ; achenium globous, ovoid or triangular, with a thick, bony 

 pericarp; style 3 -cleft, deciduous. — 4 Stems leafy. Spikes- in fasci- 

 cles or panicles. 



{ Bclep.ia. Achenium ovoid or globous, Vase invested with a short perlgynbim. (*)■ 



* Achenium smooth, ovoid. Perigynium annular, subentire Nos. 1, 2? 



* Achenium nitrous- warty, globular. l'crigynitmi 6 or 3-lobed Nos. 3, 4 



* Achenium reticulated or hispid-rugous, globular. Perigynium o-U>bed Nos. 5, 6 



§ Hypovokum. Achenium ovoid-triangular, base fluted. Perigynium none, (a) 



a Fascicles 4 to 7, interruptedly spiked. Ach. smooth or rugous Nos. 7. 8 



a Fascicles single, terminal. Achenium ribbed or snvooth .Nos. 9, ll> 



1 S. triglomerata Mx. "Wuip-grass. Culm erect, acutely triangular, rough, 

 leafy, 3 — 4fhigh; lvs. linear-lanceolate, rough-edged; spikes lateral and terminal, 

 alternate, in about 3 subsessile, iriglomerate fascicles, and much shorter than tho 

 leafy bracts; glumes ovate, cuspidate, dark purple; ach. globous, smooth and 

 polished, white, nearly 2" diam., invested at base with a,i entire, crttstaceous rim. 

 — Swamps, in nearly all the States. Jn., Jl. 



2 S. leptoculmis. Culm very slender, acutely 3-angled, 2 f high; lvs. smooth, 

 flat ; sterile spikes elongated (4 ' long), in 2 fascicles, the lateral one remote from 

 the terminal, on a long, filiform penduncle ; glumes dark purple ; stam. 3 ; ach. 

 ovoid, obtuse, white, polished minutely corrugated; perig. annular, ioith about & 

 minute tubercles. — Fla. Pairs of spikelets 3 or 4. (S. oligantha Torr. nee Mx.) 



3 S. ciliata Mx. Culm 1 to 2f high, acutely 3-angled, the angles scabrous above ; 

 lvs. channeled, pubescent as well as the sheaths; bracts fringed with long, whitish 

 hairs; fascicle subsolitary, terminal ach. subglobous, white, roughened with 

 scattered warts ; perig. a narrow border, bearing 3 obtuse tubercles. — Damp soils, 

 S. Car. to Fla. 



4 S. pauciCdra Muhl. St 10 to 16' high, triangular, slender, smoothiah ; lvs. 

 narrow, nearly smooth; sheaths pubescent; faseicles 1 to 3, few-flowered, tho 



