526 CYPERACE^E. (SEDGK FAMILY.) 



tubercle. (R. multiflora, Gray. Scirpus schoenoides, Ell.) Margins of ponds 

 in the pine barrens, Georgia, Florida, and westward. June and July. .Nuts 

 " long, several on a spike. 



14. B. caduca, Ell. Culms stout (3 -4 high), 3-angled; leaves broadly 

 linear (3" -4" wide) ; corymbs 4-6, compound, remote, the branches and short 

 pedicels erect ; spikes very numerous, approximate, ovate ; scales caducous ; 

 nuts 4-8 on the spike, obovate, biconvex, faintly wrinkled; tubercle flat, con- 

 ical, ciliate, J as long as the nut ; bristles 6, slender twice as long as the nut. 

 Swamps and wet banks of streams, Florida to North Carolina. Aug. Spikes 

 2" long. Nut twice as large as in No. 13. 



15. B. miliacea, Gray. Culms tall (3 -4 high), 3-angled ; leaves flat (3"- 

 4" wide) ; corymbs 6-8, distant, compound ; the branches and slender pedicels 

 spreading horizontally ; spikes ovate ; scales caducous ; nuts 4 8 on the spike, 

 round-obovate, biconvex ; tubercle compressed, conical ; bristles 6, slender, as 

 long as the nut and tubercle. (R. sparsa, Ell.) Bogs and deep miry places, 

 Florida to North Carolina. June and July. The nuts of this and the preced- 

 ing species remain on the spike after the scales have fallen away. 



16. B. punctata, Ell. Culms (l-2 high) slender, 3-angled; leaves 

 short, linear-lanceolate ; corymbs 3-4, cluster-like, the lateral ones simple, dis- 

 tant, and long-peduncled ; spikes ovate ; nut obovate, compressed, with transverse 

 pitted furrows, rather shorter than the 6 slightly hispid bristles ; tubercle conical, 

 compressed, shorter than the nut. Near Savannah and St. Mary's, Georgia, 

 Elliott. May and June. 



17. R. Grayii, Kunth. Culm solitary, 3-angled (2 -3 high); leaves lin- 

 ear, rigid, shining; corymbs 3-4, distant, capitate; spikes few, large, ovate; nut 

 round-obovate, tumid, slightly pitted, dull ; tubercle short-conical, dilated at the 

 base; bristles 6, as long as the nut and tubercle; stamens 3-6. (R. distans, 

 Ell. R. Elliottii, Gray.) Dry pine barrens, Florida to North Carolina. June 

 and July. 



* * Nut smooth and even : bristles hispid upward. 



18. R. megaloearpa, Gray. Culms stout (2 -3 high), 3-angled; leaves 

 rigid, linear, shining ; corymbs 4-6, distant, spreading or somewhat contract- 

 ed ; spikes (3" long) ovate, single ; nut large (2" long), orbicular-obovate, 

 biconvex, light brown, turning blackish ; tubercle short-conical from a spreading 

 base; bristles 6 -10, commonly shorter than the nut; stamens 12. (R. dode- 

 candra, Baldw. ) Dry sands along the coast of West and East Florida, and 

 Wilmington, North Carolina. May -Aug. 



19. R. Baldwin!!, Gray. Culms (2 -3 high) sharply 3-angled, rough ; 

 leaves short, glaucous, smooth, very acute ; corymbs 1-3, contracted or nearly 

 capitate ; spikes ovate, dark chestnut ; nut ovate, lenticular, twice as long as the 

 flat conical tubercle; bristles 12-14, longer than the nut; stamens 6. Wet 

 pine barrens, Georgia and Florida. June and July. 



20. B. ciliata, Vahl. Culms blunt-angled (1 - 2 high) ; leaves short, glau- 

 cous, linear-lanceolate, obtuse, fringed on the margins ; corymbs mostly solitary, 

 capitate ; spikes light brown, ovate ; nut oval, lenticular, minutely roughened ; 



