5C6 CYPERACEAi. (SEDGE FAMILY.) 



10 R. CeplmUintlia, Torr. Leaves narrowly linear, flat, keeled ; spikes 

 very numerous, crowded in 2-3 or more dense f/lobiilar heads which are distant (and 

 often in pairs), obhny-lanceolate, dark brown ; achenium orbieular-obovate, mar- 

 gined, narrowed at the base, about as long as the a\vl-shaped beak, half the 

 length of the stout bristles, which are barbed either downwards or upwards. Sandy 

 swamps, Long Island to New Jersey, and southward. Culm stout, 2 - 3 high : 

 the fruit, &c. larger than in the last, of which very probably it is only a marked 

 variety. 



14. CL.ADIUM, P. Browne. TwiG-Rusn. 



Spikes ovoid or oblong, of several loosely imbricated scales ; the lower ones 

 empty, one or two above Bearing a staminate or imperfect flower ; the terminal 

 flower perfect and fertile. Perianth none. Stamens 2. Style 2- 3-cleft, decid- 

 uous. Achenium ovoid or globular, somewhat corky at the summit, or pointed, 

 without any proper tubercle. Perennials, with the aspect of Rhynchospora. 

 (Name from /cXciSos, a twig or branch, perhaps on account of the branching styles 

 of some species.) 



1. C. lliariscoicles, Torr. Culm obscurely triangular (l-2 high); 

 leaves narrow, channelled, scarcely rough-margined ; cymes small ; the spikes 

 clustered in heads 3- 8 together on 2-4 peduncles; style 3-cleft. (Schcenus, 

 .Muhl.) Bogs, New England to N. Illinois, and northward. July. 



15. SCLEKIA, L. NUT-RUSH. 



Flowers monoecious ; the fertile spikes 1-flowered, usually intermixed with 

 clusters of few-flowered staminate spikes. Scales loosely imbricated, the lowor 

 ones empty. Stamens 1-3. Style 3-cleft. Achenium globular, stony, bony, 

 or enamel-like in texture. Bristles, &c. none. Perennials, with triangular 

 leafy culms. (Name oveXjjpia, hardness, from the bony or crustaccous fruit.) 



* Achenium smooth and polished : its base surrounded by an obscurely triangular cms* 



taceous ring or disk: stamens 3. 



1. S. trigflomerata, Michx. Culm (2 -3 high) and broadly linear 



roughish ; fascicles of spikes few, terminal and axillary, in triple clusters, 

 the lower peduriclcd ; achenium ovoid-globular, slightly pointed (2" broad) 

 how grounds, Vermont to Wisconsin, &c. ; common southward. July. 



* # Achenium reticulated, seated on a JJat/ish (tide of 3 consjticnous and ovate-lan- 



ceolate entire scale-like lol>es: sfann us 2. 



2. S. Klirtsl ji^, Michx. Culms slender (1 high); leaves narrowly 

 linear; clusters loose, axillary and terminal, sessile or short-prdunded ; a</ie- 

 niinn ytobiiliir, <I'i>hj pittl between the regular reticulations, not hairy* Sandy 

 swarnps, Eastern Massachusetts to New Jersey, Virginia, ami southward: rare. 

 August. 



3. 8. Iflxa, Torr. Culms slender and weak (l-2 high) ; leaves linear; 

 clusters loose, the lower mostly long-peduncled and drooping; arht-nimn globular^ 

 pitted and somewhat spirally marked with minutely hnin/ wrinkles, Sandy swamps, 

 Long Island, New Jersey, and southward, near the coast. Too like the last. 



