506 CTPERACE.E. (sedge FAMILY.) 



10. R. ceplialcintlia, Ton-. Leaves nairowly linear, flat, keeled ; spikeg 

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

 often in pairs), oblong-lanceolate, dark brown ; achenium orbicular-obovate, mar- 

 gined, narrowed at the base, about as long as the awl-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 rery probably it is only a marked 

 variety. 



14. CL,ADI1Jm, P. Browne. Twig-Rdsh. 



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

 6™P'y) 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 lihynehospora. 

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

 of some species.) 



1. C. niarjscoides, Toit. Culm obscurely triangular (l°-2° high); 

 leaves nan'ow, channelled, scarcely rough-margined ; cymes small ; the spikes 

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

 Muhl.) — Bogs, New England to Penn., Ohio, and northward. July. 



15. SCIiERIA, L. Ndt-Rush. 



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

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

 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 (rxXi/pia, hardness, from the bony or crustaceous fruit.) 



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



taceous ring or disk ; stamens 3. 



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

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

 the lower peduncled; achenium ovoid-globular, slightly pointed (2" broad). — 

 Low grounds, Vei-mont to Wisconsin, &c. ; common southward. July. 



* # Achenium reticulated, seated on a flattish disk of 3 conspicuous and ovate-lan- 



ceolate entire scale-like lobes: stamens 2. 



2. S. reticularis, Michx. Culms slender (1° high); leaves narrowly- 

 linear; clusters loose, axillary and terminal, sessile or short-ped uncled ; ache- 

 nium globular, deeply pitted between the regular reticulations, not hairy. — Sandy 

 swamps, Eastern Massachusetts to New Jersey, Virginia, and southward : rare. 

 August. 



3. S. laxa, Torr. Culms slender and weak (I°-2° high) ; leaves linear ; 

 clusters loose, the lower mostly long-peduncled and drooping; achenium globular, 

 pitted and somewhat spirally marked with minutely hairy wrinkles. — Sandy swamps. 

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



