526 CYPERACE^. (sedge FAMILY.) 



tubercle. (R. nmltiflora, Gray. Scirpus scliccnoidcs, Ell.) — Margins of ])ond8 

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

 J" long, several on a spike. 



14. R. 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; tul)ercle flat, con- 

 ical, ciliatc, I as long as the nut ; bristles 6, slender twice as long as the nut. — 

 Swamps and wet banks of streams, Florida to Nortli Carolma. Aug. — tjpikes 

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



15. R. miliaeea, Gray. Culms tall (3°- 4° high), 3-angled ; leaves flat (3"- 

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

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

 round-obovate, biconvex ; tubercle compressed, conical ; bristles G, 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 tlic scales have fallen away. 



16. R. pvinctata, Ell. Culms (l°-20 high) slender, 3-angled; leaves 

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

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

 pitted furrows, rather shorter than the 6 sligluly 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 aiul even : bristles hispid upward. 



18. R. megalocarpa, Gray. Culms stout (2° -3° high), 3-anglcd; 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, Daldw.) — Dry sands along the coast of West and East Florida, and 

 'VVilmiii;.'l(jii, N(jrili Carolina. May -Aug. 



19. R. Baldwinii, Gray. Culms (2° -3° high) sharply .3-anglcd, 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. R. ciliata, Vahl Culms blunt-angled ( 1° - 2° iiigli) ; leaves short, glau- 

 cous, liiiear-laiKTolatc, obtuse, fringed on tlie margins ; corymbs mostly solitary, 

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



