532 CYPERACE^E. (SEDGE FAMILY.) 



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

 Caroliniana, WiUd., 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 erect 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. HYPOPORUM. Disk none : nut concave and often jutted at the sides of 

 the triangular base. 



* Clusters of spikes terminal, leafj-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 tho 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 and July. — Plant brownish, tufted. 



* * Clusters of spikes (small) 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, eiliate at the 

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

 scales lanceolate, rough-pointed; stamens 3j nut obovatc, obscurely 3-anglcd, 

 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 and July. 



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

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

 3-angled, very minute, pointed, smooth, not pitted at the base. (S. interrupt*, 

 Miclir., not of Richard.) — Low pine barrens, Florida to South Carolina. July 

 and Aug. 



21. CAREX, L. Sedge. 



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

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

 many rows. Stamens 2-3. Style 2-3-eleft, exserted from a sac ( pcrigynium) 

 which encloses the ovary and the lenticular biconvex or 3-angled nut.— Peren- 



