532 CYPERACE^E. (SEDGE FAMILY.) 



wart-, those at the base elongated ; lobes of the disk 6, distinct, globose. (S. 

 Caroliniaua, WilUL, the villous form.) 



Var. glabra. Smooth throughout, or the leaves and bracts scabrous at the 

 summit; culms erect (1° high), rigid, but slender, like the ereel leaves ; clusters 

 terminal ; spikes many-flowered ; lobes of the disk 3, each 2-lobcd. This also 

 varies, with longer (2°-2£°) diffuse culms, and with 1 - 2 distant axillary clus- 

 ters on long (5' — 10') drooping peduncles. — Low sandy pine barrens, Florida, 

 and northward ; the varieties chiefly southward. May- Aug. 



§ 2. 11 Vl'OPORUM. Disk none: nut concave and often pitted at tlie sides of 



the triangular base. 



* Clusters of spikes terminal, leafy-bracted. 



8. S. Baldwinii, Torr. Culms rough above (2° -3° high); leaves mostly 

 2, linear, rigid ; nut large (2" long) dull white, globose-ovate, obscurely angled, 

 longitudinally furrowed, concave at the sides of the abruptly contracted base, 

 slightly pointed. — Pine-barren swamps, Florida and Georgia, near the coast 

 June and July. 



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

 leaves; nut small (1" long), ovate, dull white, fin-rowed lengthwise, the sides at 

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

 June and July. — Plant brownish, tufted. 



* * Clusters of spikes (sum/I) numerous, scattered near the summit of the culm, form- 

 ing 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 8-5, erect; 

 scales smooth ; nut very small, globose-3-anglcd, pointed, rough witlv 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 and .July. 



12. S. Michauxii. Culms (6'- 12' high) smooth; leaves linear, and, like 

 the sheaths, hairy ; clusters 4 -6, nodding; scales bristle-awned ; nut globose- 



3-angled. very minute, pointed, si lb, not pitted at the base. (S. interrupt:!, 



Michx., net of Richard ) — Low pine barrens, Florida to South Carolina. July 

 and Aug. 



21. CAREX, L. Sedgb. 



Flowers monoecious, rarely dioecious, spiked. Sterile ami fertile flowers in 

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

 many rows. Stamens 2-3. Style 2-3-cleft, BXSeited from a sac ( p, rini/ninm) 

 which encloses the ovary and the lenticular biconvex or .'! angled nut.— lYicti 



