560 CYPERACE.E. (SEDGE FAMILY.) 



even, or longitudinally furrowed, concave at the sides of the abruptly con- 

 tracted base, slightly pointed. Pine barren swamps, Florida and Georgia, 

 near the coast. June - July. 



9. S. gracilis, Ell. Culms slender (1 high), smooth, like the filiform 

 leaves; nut small (1" long), ovate, dull white, furrowed lengthwise, the sides 

 at the base concave and pitted. Low pine barrens, Florida to South Carolina. 

 June July. Plant brownish, tufted. 



* * Clusters of spikes (small) numerous, scattered near the summit of the culm, 

 forming an interrupted compound spike : bracts mostly short. 



10. S. filiformis, Swartz. Glaucous; culms slender (l-2 high), 

 smooth ; leaves narrowly linear, rough on the margins and keel, ciliate at the 

 throat; clusters 3-4, erect, few-flowered, the lowest remote, leafy-bracted ; 

 scales lanceolate, rough-pointed ; stamens 3 ; nut obovate, obscurely 3-angled, 

 smooth and glassy, concave at the base, not pitted. South Florida. Oct. 



11. S. verticillata, Muhl. Culms very slender (6'- 12' high), smooth, 

 like the narrowly linear or filiform leaves and sheaths; clusters 3-5, erect; 

 scales smooth ; nut very small, globose-3-angled, pointed, rough with raised 

 wavy ridges, not pitted at the base. Varies with hairy sheaths, more numer- 

 ous (6 - 9) clusters, and reticulated nuts. Damp soil, Florida, and northward. 

 June- July. 



12. S. hirtella, Swartz. Culms (6 -12' high) smooth; leaves linear, 

 and, like the sheaths, hairy ; clusters 4-6, nodding ; scales bristle-awn ed ; nut 

 globose-3-angled, very minute, pointed, smooth, not pitted at the base. Low 

 pine barrens, Florida to South Carolina. July - August. 



20. CAREX, L. SEDGE. 



Flowers monoecious, rarely dioecious, spiked Sterile and fertile flowers in 

 the same spike (androgynous), or in separate spikes. Scales imbricated in few- 

 many rows. Stamens 2-3. Style 2-3-cleft, exserted from a sac (perigy- 

 ni'iim) which encloses the ovary and the lenticular biconvex or 3-angled nut. 

 - Perennials, with grass-like leaves. Spikes from the axils of scale-like or 

 leaf-like bracts, simple or compound. 



1. VIGNEA. Stigmas tiro: nut lenticular, or more or less compressed. 



I. Spikes all androgynous, short, sessile, mosth/ r.rrn'd/'nij the bracts. 



* Sterile and fertile flowers variously disposed. 



1. C. bromoides, Schk. Spikes 4-fi, distinct, oblong-lanceolate, com- 

 pressed ; perigynia lanceolate, erect, finelv nerved, ending in along flat rough- 

 margined 2-cleft beak, longer than the ovate-lanceolate mncronate scale. 

 Swamps and bogs, Florida, and northward. March -April Culms tufted, 

 weak and slender, 1- H high. Leaves narrowly linear. Spikes occasion- 

 ally wholly sterile <r fertile. Perigynia somewhat 2-ranked 



