CYPERACE.E. 



401 



v lucre 2-leaveJ; umbel usually deeoinpouud ; spikes oblong, acute, single or 2 or 3 

 together at the end of the rays ; stimens 2 or 3 ; achenium obovate-triangular. 



Mud'dy ground.-'. Aug.— Oct. Cn'm 8 to 12 inches high. Leuves mostly radical. 

 Scales rusty brown with a green keel. 



0. F. PAPILLARIS, Gray. Capillary Fimhristylis. 



Low, densely tufted; culms capillary, much longer than the bristle- form leav^e; 

 sheaths hairy at the throat; involucre 2 or 3-leaved ; umbel compound or cymose- 

 panieled; spikes ovoid-oUoug; stamens 2; aehettium yery obtuse, tipped wi.h the 

 minute bulb. 



5iu:dy Selda, common. Aug. Culm 3 to 8 inches high. Ltaia mostly radical. 

 Scales rusty -i. . green keel. 



8. CERATOSCHCENU3, Nees. Horned Rush. 



Gr. haras, a horn, and sehoinos, a nish. 



Spikes 2 to 5-flowered r one perfect, and 1 to 4 staminate. 

 Scales few and loosely imbricated, the lower empty. Pe- 

 rianth of 5 or G rigid or cartilaginous bristles. Stamens 

 3. Style simple, entirely hardening into a long beak with 

 a narrow base, much, exserted, and several times longer than 

 the flat and smooth achemum. — Pe.rennio.hf with triangular 

 teafy culms andldrge spikes clustered in simple or compound terminal 

 end capillary cymes. 



2. C CORNICCLATA, XcC3. 



€ym*s decompound; diffuse ; bristles strl-ahaped, stout, unequal, shorter than the 

 tch. nium. 



Wet places. Aug. £:;' ' triangolar. learns 12 to 13 inches 



long, y % inch wide. Frw a th inchloajj. 



». RHYNCHOSpQRA, Yahl. Beak-rush. 



Gr. rujcTws, a snout, and spora, a seed; from the beaked acheniuro. 



Spike ovate, few to several-flowered. Scales loosely im- 

 bricate, the lower one3 smaller and empty. Bristles 6, 

 rarely more. Stamens mostly 3. Style 2-cleft. Achen- 

 ium lenticular or globular, crowned with the persistent base 

 of the style. — Perennials, with more or less triangular leafy 

 culms, and small spikes in terminal and axillary clusters, cymes or 

 heads, 



1. K. cymosa, Nutt. Tufted Beaferusk, 



Culm triangular; leaves linear, flat; cymes corymbose ; sp&es crowded and ely> 

 tered; achev.ium round-obovate, twice the length of the bristles. 

 Low grounds, rare. July, Aug. Culm \2 to 13 inches high, slender. 



2. It. alba, Yahl. White Beak-rush. 



Culm triangular aboye; leaves aearly bristle-form; spikes several corymb-ela*. 

 tered, lanceolate; stamens usually 2; achenium OYOid, narrowed at the baje, shartcj 

 than tho W to 11 bristle?. 



R2* 



