302 TRIANDRIA MONOGYNIA. 



S. atrovirens : culm triangular, leafy ; cyme terminal, compound, proli- 

 ferous ; involucrum 3-leaved ; spikes conglomerate, ovate, acute 

 glumes ovate, mucronate, pubescent. 



HAB. Wet meadows. June July. %. Culm obtusely triang. 2ft. 

 high ; involuc. long ; spikes dark green, in heads of 10 12. 



S. brunneus : culm leafy, obtusely triangular ; cyme decompound ; in- 

 volucrum 3 4-leaved ; spike round-ovate, clustered in about sixes ; 

 glumes ovate obtuse. 



HAB. In water. Aug. Sept. Ij.. Culm 2 3 ft. high; leaves long; 

 spike brown ; seed longer than the bristles. 



S. macrostachyos : culm triquetrous, leafy ; corymb clustered ; involu- 

 crum about 3-leaved, very long; spikes oblong; glumes ovate, 3- 

 clefl ; the middle segment subulate and reflexed ; style 3-cleft. 

 HAB. In salt marshes and ditches. July Aug. 1J.. Culm 3 iff. 

 high ; spikes 6 10, very large. 



t t t Style filiform, deciduous. Bristles much longer than the seed. 



S. Eriophorum : culm obtusely triangular, leafy ; panicle decompound, 

 proliferous, nodding ; spikes all pedunculate ; bristles surrounding 

 the seed exserted. 



HAB. Swamps. Aug. 1J.. Culm 4 5 feet high ; involuc. leafy, very 

 long ; panic, much divided ; spikes small, ovate, woolly when ripe 



* * Seed naked at the base. 

 t Style simple at the base, not articulated to the seed, deciduous. 



S. capillaris : culm nearly naked, triquetrous, capillary ; spikes ovate ; 



2-3 of them pedunculate, with an intermediate sessile one. 

 HAB. Sandy fields. Aug. <v) 1 A span high, cespitose ; leaves seta- 

 ceous, short, serrulate ; spikes brownish, subumbellate. 

 S. autumnalis : culm compressed, ancipitous ; umbel compound ; invo- 

 lucrum 2-leaved ; spikes lanceolate, acute, somewhat 4-sided. 

 HAB. Boggy grounds. July Oct. 7J.. Culm 8-12 in. high ; leaves 

 long ; umbel loose ; glumes ovate, mucronate, carinate. 



20. SCHCENUS. Bog-rush. 



S. mariscoides : culm terete, or a little sulcate, leafy ; leaves channelled, 

 semiterete ; umbel terminal ; fascicles of spikes three on each peduncle ; 

 seed naked, rounded at the base. 



HAB. Bogs. July. %. Culm 2 feet high ; fascic. about 12-spiked ; 

 spikelets lanceolate ; glume ovate. 



81. RHYNCHOSPORA. 



R. alba : spikes in corymbose fascicles ; culm triangular above ; leaves 



setaceous ; seed somewhat lenticular ; bristles about 10. 

 HAB. Bogs and swamps. July Sept. 7J.. Fasc. axil, and terminal, 



bracteate ; glum, white ; seed substipitate. 



R. glomerata : spikes in corymbose fascicles, very distant, by pairs ; 

 culm obtusely triangular ; leaves flat ; seed obovate-cuneiform, very 

 smooth, as long as the tubercle. 



HAB. Swamps and bogs. July Sept. Culm leafy ; leaves cari- 

 nate ; spik. at. and term. ; glum, brown. 



