570 CTPERACE.E. (SKDGE FAMILY.) 



jecting bealc or sfi/h ahout V hnj. (This long beak gives the name, fron» 

 Kipas, a horn, anil (t-j^o'ivos, a rush.) 



13. R. eorniculkta, (imy. (IIohnkd lUisn.) Ci/i)ies decompound, dif- 

 fuse; brisilen aivl-s/uifH'xl, stout, nnequul, shorter than the achenium. — Wet plares, 

 Penn. to Illinois, antl southward. — Culni 3°-6° high. Leaves about 6" wide. 



14. R. macrostichya, Toir. Ci/mes dec-ompouiul, or in tlie northern 

 form somcuhut Kim/>l>'. and smaller, and the spikes usually more flustered ; hn'sllo 

 capillari/, twice the length of the oc/ien/ww. — Borders of ponds, Massachusetts, 

 Khode Island, New Jersey, and southward: rare. — Perhaps it runs into the 

 preceding. 



13. C LABIUM, P. Browne. Twig-Rush. (Plate 5.) 

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

 empty, one or two above bearing a staminate or innperfect flower ; the terminal 

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

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

 without any tubercle, in which it differs from Khynchospora. (Name from 

 KKaboi, a twig or branch, perhaps on accoutit of the twice branching styles of 

 some species.) 



1- C. mariscoides, Tom Perennial; culm obscnreiy triangular 

 (10_20 high); leaves narrow, channelled, scarcely rouiih-mar^ined ; cymes 

 small; the spikes clustered in heads 3-8 together on 2 to 4 peduncles; style 

 once 3<'left. — Bogs, New England to Delaware, Illinois, and northward. July, 



14. SCLERIA, L. Nt;T-Rrsn. (PI. 5.) 

 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-clefr. Achenium globular, stony, liony, 

 or enamel-like in texture. Bristles, &c. none. I'crennials, Avith triangular 

 leafy culms, mostly from creeping rootstocks : flowering in summer: all in low 

 ground or swamps. (Name (T<\r]pla, hardness, from the indurated fruit.) 



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

 leaves rougliish ; fascicle*^ of spikes few, terminal and axillary, in triple clusters, 

 the lowermost pedunded : nfomens 3 ; achenium smooth and polished, on an obscure 

 crustaceous ring or disk. — Vermont to Wisconsin, and common southward. 



2. S. reticularis, Midix. Culms slender (l°high); leaves narrowly 

 linear; clusters loose, axillary and terminal, sessile or the lower on short slen- 

 der peduncles ; stamens 2 ; achenium globular, regularli/ pitted-reticulated, not hairy, 

 resting on a double disk, each of three greenish appressed superposed calyx-like 

 lobes, the inner larger. — Eastern Massachusetts to Virginia and southward: 

 rare northward. 



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

 clusters loose, the lower mostly lonLC-p''dnncled and drooping; achenium globular, 

 irregularli/ pilttd-reticulutid or pilted-rugosp, towards the base minuteli/ hairy on the 

 somewhat spiral wrinkles : otherwise as in the foregoing. — E. Massachusetts to 

 New Jersev, Pennsvlvania, and southward. 



