506 eYPERACKJi. (SKDOK FAMILY.) 



10. R. COptial^lltlia, Tovr. Leaves narrowly linear, flat, keeled ; 

 very numerous, crowd-d in 2-3 or more dense yhbidar heads which are distant (and 

 often in pairs), oblong-tanceolale, 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' very probably it is only a marked 

 variety. 



14. CI.ADIUOT, P. Browne. Twio-RusH. 



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 Khynchospora. 

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

 of some species.) 



1. C. mariSCOldes, 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, 

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



15. S GLORIA, L. NUT-RUSH. 



Flowers monoecious ; 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 ovcX^pict, hardness, from the bony or crustaceous fruit.) 



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



taceous ring or disk: stamens 3. 



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

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

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

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



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



ceolate entire scale-like lobes: stamens 2. 



2. S. rcticillikris, Michx. Culms slender (1 high); leaves narrowly 

 linear; clusters loose, axillary and terminal, sessile or sho rt-pcd uncled ; ache" 

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

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

 August. 



3. S. l&xa, Torr. Culms slender and weak (l-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. Tuo like the last. 



