366 ORDER 154. CYFERACK^. 



9 R. deciirrens Chapm. Culm, leaves, and cyme? as iii the last; spike 1"; ac&, 



obovate, as long as the setae, the tubercle decurrent on its 2 edges. Marshes, Fla. 



10 R. mtliacea (Lam.) Culm slender, 3-angled, 2 4f; leaves linear, flat, 63' bt 

 3 4" : spikes obovate, all pedicellate, in diffusely spreading cymous panicles ; ach. 

 round-obovate, little shorter than the seta;. Wet barrens, S. 



11 R. caduca Ell. Culm acutely 3-angled, 1 3f; leaves linear, 2 3'' broad; epikea 

 ovate, large, 4 5", sessile or stalked, in (several rather close erect cymous panicles ; 

 glumes caducous ; ach. roundish, ^ as long as the settc. Wet, S. 



12 K. schoenoidcs (Ell.) Culm 3-angled, 2 3f; leaves linear, 2" wide; spikes (2") 

 small and numerous, subsessile, clustered, in several paniculate cymes ; setse twice as 

 long as the obovate flat achenium and small tubercle. Bogs, S. 



13 R. patula Gr. Culm 3-angled, thick and stout at base, 2 3f; leaves linear, 

 short ; spikes ovate, 2", in several spreading loose panicles ; ach. strongly rugous, 

 with a large tubercle, some shorter than the setse. Ga., Fla. 



14 R. Elliottii Gr. Culm solitary, 2 3f; leaves shining, rigid ; corymbs 3 or 4, 

 few-flowered, subsimple ; spikes large ; ach. minutely rugous, with a very short 

 tubercle, little shorter than the set;e. Pine barrens, S. (R. distans Ell.) 



15 R. punctata Ell. Culm 3-angled, 1 2f; leaves lance-linear; corymbs of fasci- 

 cles; ach. rngous-netted, with rows of impressed dots. Marshes, Ga., Fla. 



16 R. microcarpa Baldw. Culm 2f, teretish ; leaves narrowly-linear, setaceous at 

 end ; spike turgid-ovate, 12" ; ach. ovate, flat, minute. Wet, S. 



1 7 R. pusilla Chapm. Corymbs 2 3, distant, of minute, scattered ovate, 3- flowered 

 spikes ; ach. lens-shaped, oblong-ovate, white. Woods, S. Car. to Fla. If. 



18 R. CJliapmaiiii Curtis. Corymb capitate, terminal, dense ; spikes with 5 scales 

 and 1 flower; ach. oval, polished ; stamens 1 or 2. S. Car. to Fla. IJf. 



19 R. alba Vahl. (Fig. 10.) Culm 1020', very slender; leaves linear-setaceous; 

 spikes (Fig. 11) whitish, lanceolate, in stalked, corymbous fascicles; setae 9 12, as 

 long as the ach. (Fig. 12) and tubercle. Common in wet shady grounds. July Sep. 



20 R. Kiiieslternil Carey. In tufts 610', filiform ; spikes 1", brown, in 35 

 dense, sessile, remote fascicles ; setae 6, as long as the ach. Iron soils, N. J. : rare. 



21 R. capillacea Torr. In tufts, 6 10', setaceous, 3-angled; clusters of brown 

 spikes mostly 2, few-flowered ; sofas 6, much longer than the ach. Swamps, M., W. 



22 R. glomerata Vahl. Culms If, leaves linear; fascicles brown, remote, in sev- 

 eral pairs; spikes lanceolate, 2" ; ach. obovate, as long as its tubercle, which equals 

 the (5 seta?. In bogs, Can. to Fla. July, Aug. 



23 R. oeplialantlia Torr. Culms 2 3f, stout; leaves linear; heads globular, 

 dense, remote, sessile, solitary in the axil or terminal, dark-brown ; ach. round- 

 ovoid, obtuse, half as long as the 6 seta3. Barrens, N. J. 



24 R. Haldwiiiii Gray. Culms slender, 2 3f; leaves linear; spikes ovate, in a. 

 dense terminal corymb of fascicles ; setae 12; stamens 6. Pine barrens, Ga. 



25 R. dodecaudra Baldw. Culms rigid, stout, 1 8f; leaves rigid, linear, erect; 

 spikes 4", ovate, in 4 or 5 loose, stalked cymes ; stamens 12 ; setae G 12, long as the 

 large (H"), roundish, smooth achenium. Bogs, S. (R. megalocarpa.) 



26 R. lasciciilaris Nutt. Culm teretish, wiry, 1 2f; leaves short, narrowly 

 linear; spikes small (If") in several dense fascicles mostly terminal; set* 4 6, 

 shorter or longer than the obovoid brown ach. Wet, S. 



27 R. distans N. Like No. 2U. but every way smaller; spikes \" long, in a dense 

 terminal and often a distant lateral fascicle ; setye about equalling the ach. S. 



28 R. ciliuta Vahl. Glaucous, 8' 2f; leaves short, linear, obtuse, ciliate on the 

 edges ; spikes all in a dense terminal fascicle ; sctte 0, half the length of the ach. S. 



29 R. pallida M. A. Curtis. Culm firmly erect, 1 2f, 3-anglecl ; spike? pale-tawny, 

 (like R. alba) in a dense terminrl head with often a lateral head on a long peduncle; 

 ach. roundish, tubercle minute, sette 03, minute. Bogs, N. J. to N. C. 



30 R. fit sco. R. & S. Culm (K- 12') and leaves setaceous; spikes ovate-oblong, 2'' 



