526 cyperacejE. (sedge family.) 



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

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

 J" long, several on a spike. 



\i. 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 ; spiJses very numerous, approximate, ovate ; scales caducous ; 

 nuts 4-8 on the spike, obovate, biconvex, faintly wrinkled ; tuliercle 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,. miliaeea. Gray. Culms tall (3°- 4° high), 3-angled ; leaves flat (3"- 

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

 spreading liorizontally ; 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. (K. 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. R. punctata. Ell. Culms (l°-2° high) slender, 3-anglcd ; leaves 

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

 tant, and long-peduneled ; 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-obovatB, 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. EUiottii, Gray.) — Dry pine barrens, Florida to North Carolina. June 

 and July. 



* * Nut smooth and even : bristles hispid upward. 



18. R. megalocarpa, 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. Baldwiuii, Gray. Culms (2° -3° high) sharply S-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 tlian the nut; stamens 6. — Wet 

 pine barrens, Georgia and Florida. June and July. 



20. R. ciliata, Vahl. Culms blunt-angled (1° -S° high) ; leaves short, glau- 

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

 ca,pitate; ^ikes light brown, ovate; nut oval,lfiOticular, .minutely roughened; 



