532 ctperacejE. (sedge family.) 



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

 Caroliniana, Willd., 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-flowcrcd ; lobes of the disk 3, each 2-lobed. This also 

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

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

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



§ 2. IIYPOPORUM. Disk none: mil concave and often pitted at the sides of 

 the triantjular 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, 

 sliglitly pointed. — Pine-barreu 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, 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 inteniipted compound spike : bracts mostly short. 



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

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

 throiit ; 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 (G-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. interrupta, 

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

 and Aug. 



21. CAREX, L. Skdge. 



Flowers monoecious, rarely dia-cious, spiked. Sterile and fertile flowers in 

 the same spike ((tudror/i/nons), or in separate spikes. Scales imbricated in fcw- 

 many rows. Stamens 2-3. Style 2-3-cleft, exsertcd from a sac {j>erifji/ninm) 

 which encloses the ovary and the lenticular biconvex or 3-anglcd nut. — Pcren- 



