746 ORDER 155. CYPERACE^E. 



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

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

 niculata Gray.) 



2 C. macrostachya Torr. Glabrous ; culm 2 3f high, triangular ; Ivs. 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 ; style persistent, nearly 4 times as long as the ache- 

 nium. Mass. (Bobbins). (Rhyncospora ejusd.) 



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

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

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

 and corky above. U Stern leafy. Corymbs or panicles terminal and 

 axillary. 



1 C. mariacoides 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, 

 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- 

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



2 C. effusum Torr. SAW-GRASS. Culm obtusely 3-angled, 6 to 1 Of high; Ivs. 3 

 to lOf ! 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. Ponds and swamps, N. Car. to La. (Hale). A coarse and 

 rank sedge. 



17. SCLE'RIA, L. NUT SEDGE. (Gr. OKkrjpo^ hard ; alluding to 

 the indurated shell of the fruit.) Fowers 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. 



5 SCLEEIA. Acheniam ovoid or globous, base invested with a short perigynium. (*) 



* Acheniuui smooth, ovoid. Perigynium annular, subentire Nos. 1, U 



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



* Achenium reticulated or hispid-rugous, globular. Perigynium 3-lohed Nos. 5, 6 



HTPOPOKUM. 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 smooth Nos. 9, 10 



1 S. triglomerata MX. WHIP-GRASS. Culm erect, acutely triangular, rough, 

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

 alternate, in about 3 subsessile, triglomerate 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. 

 Swamps, in nearly ail the States. Jn., Jl. 



2 S. leptoculmis. Culm 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. Pla. 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 ; 

 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 narrow border, bearing 3 obtuse tubercles. Damp soils, 

 S. Car. to Fla. 



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

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



