746 Ordee 155.— CTPBEACBjE. 



ihcm die achenium, •which ia 2" long, and crowned with the (1") long, subulate, 

 horny style. — Ohio to Fla. Common in wet places. Aug. Ehyncospora oor- 

 niculata Gray.) 

 2 C. macrostachya Torr. Glabrous ; oulm 2 — 3f high, triangular ; Ivs. 1 — 2f 

 by 2 — i", rough-edged; axiUary corymbs subsimple, tertnmal ones compound; 

 upper spikelets densely fascicled ; ach. ovate, smooth ; bristles erectly hispidi, 

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

 nium. — Mass. (Bobbins). (Ehyncospora ejusd.) 



16. CLA^DIUM, Browne. Flowers 5 !^ ? ; glumes imbricated some- 

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

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

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

 axillary. 



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

 rigid I Ivs. narrowly linear, channeled above, rounded beneath, m.uch 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, 

 lance-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. (Schoenus, Muhl.) 



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

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

 sharply serrate-barbed; corymbs numerous, decompound, diflfuse, approxima,ted 

 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 coarse and 

 rank sedge. 



17. SCLE^RIA, L. Nut Sedge. (Gr. OKXrjpog, hard ; alluding to 

 the indurated shell of the 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. — U Stems leafy. Spikes in fasci- 

 cles or panicles. 



§ ScLBRTA. Achenium ovoid or globous, base invested with a short perigynium. (*) 



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



* Achenium rugous- warty, globuhir. rerigynium 6 or S-lobed Nos. 8, 4 



* Achenium reticulated or hispid-rugous, globuljvr. Perigynium 8-lobed Nos. 5, 6 



§ Hypoporu.\i. Achenium ovoid-triangular, bitse 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 smooth Nos. 9, 10 



1 S. triglomerata Mx. "Whip-gra'Bs. Oulm erect, acutely triangular, rough, 

 i^fV: 3 — 4f high ; Ivs. linear-lanceolate, rough-edged ; spikes lateral and terminal, 

 alternate, in about 3 subsessile, trighmerate 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, cmstaceous rim. 

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



2 S. leptoctilmis. Culm very slender, acutely 3-angled, 2f high ; 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 spikelets 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; fjsoicle 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. pauoiflora Muhl. St. 10 to 16' high, triangular, slender, smoothish; Iva. 

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



