746 Okdeb 155.— CTPEEACE2E. 



Oum the achenium, which ia 2" long, anA crovraed with the (7") long, subulate, 

 horny style. — Ohio to Fla. Common ia wet places. Aug. Ehyneospora cor- 

 niculata Gray.) 

 S C. maorostdohya Torr. Glabrous ; 'culm 2 — 3f high, triangular ; Ivs. 1 — 2f 

 by 2 — 4 ', rough-edged ; axillary corymbs subsimple, terminal ones compound; 

 upper spikeleta densely fascicled ; ach. ovate, smooth ; bristles erectly hispid, 

 twice as long as the achenium, ; style persistent, nearly 4 times as long as the ache- 

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



i6. CLA^DIUM, Browne. Flowers <J f^ $ ; glumes imbricated some- 

 what in 3 rows, lower ones empty; bristle* ; stam. 2; style 2 — 3- 

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

 and corky above. — y Stem leaty. Corymbs or panicles terminal and 



axillary. 



X C. mariscoides Torr. Boa Rush. St. terete, leafy, 20 — 30' high, hard and 

 rigid ; Ivs. nairrowly linear, channeled above, rounded beneatli, much sliorler than 

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

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

 iance-ovate, 3'' long ; glumes tawny-brown, about 6, the upper usually ^ , the 

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

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



2 C. effCisum Torr. Saw-grass. Culm obtusely 3-angled, 6 to lOf high; Ivs. 3 

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

 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. — lo-irts and swamps, N. Car. to La. (Hale). A coarse and 

 rank sedge. 



17. SCLE^RIA, L. Nut Sedge. (Gr. aKX.7jp6g, hard ; alluding to 

 the indurated shell of the fruit.) Powers 8 , stamiiiate 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. — U Stems leafy. Spikes in fasci- 

 cles or panicles. 



$ ScLERiA. Aclienium ovoid or globous, base invested with a short perigynium. (*) 



* Achenium smooth, ovoid. Perigynium annular, subentiro Nos. 1, 2 



* Achejiium rugous-warty, globular. Perigynium 6 or 3-lobed Nos. 3, 4 



* Achenium reticulated or hispid-rugous, globular. Perigynium S-lobed Nos. 5, 6 



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



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



a Fascicles single, terminal. Achenium ribbed or smooth Nos. 9, 10 



1 S. triglomerata Mx. "Whip-seass. Culm erect, acutely triangular, rough, 

 leafy, 3 — 4f high ; Ivs. linear-lanceolate, rough-edged ; spikes lateral and terminal, 

 alternate, in about 3 subsessile, trigloTnerate fascicles, and much shorter than the 

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

 polished, white, nearly 2" diam., invested at base with an entire, crustaceous rim. 

 — Swa>nps, in nearly all the States. Jn., Jl. 



2 S. leptocljlmis. Oulm very slender, acutely 3-angled, 2fhigh; Ivs. 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, with about 8 

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



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

 Ivs. 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 na/rrow border, bearing 3 obtuse tubercles. — Damp soils, 

 S. Car. to Fla. 



4 S. pauciflora Muhl. St. 10 to 16' high, triangular, slender, smoothish; Iva. 

 narrow, nearly smooth ; sheaths pubescent; fascicles 1 to 3, few-flowered, the 



