52G CYPRRACF.yF.. (sKIXJK lAMII.V.) 



tubi'ivk'. (R. muUidom, (Iniii. Scirpus sclia-noiilos, Kll.) — ^fargins of ponds 

 in tlic pine Imnens, Cuoigia, Florida, and wchlwurU. June and July. — 2suts 

 J'' long, several on a spike. 



14. R. caduca, Kll. Culms stout (.3°-4° liigli), S-anglcd ; leaves broadly 

 linear (;j"-4" wide) ; corymbs 4-G, compound, remote, tlic 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 G, slender twice as long as the nut. — 

 Swam])S and wet banks of streams, Florida to North Carolina. Aug. — .Sjjikes 

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



15. R. miliacea, Gray. Culms tall (3°-4<' Idgh), 3-angled ; leaves flat (3"- 

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

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

 round-obovatc, biconvex ; tubercle compressed, conical ; bristles G, slender, as 

 long as the nut and tubercle. (R. sparsa, /s//.) — Bogs and deep miry jjlaces, 

 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 (lo-2° high) slender, 3-anglcd ; leaves 

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

 tant, and long-])cdunclcd ; spikes ovate ; nut ol)ovate, com])ressed, with transverse 

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

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

 Elliott. May and June. 



17. R. Grayii, Kunth. Culm solitarj% 3-anglcd (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-G. (R. distans. 

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

 and July. 



* * Nut smooth and rven; bristles hispiil upward. 



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

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

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

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

 ba.sc ; bristles 6 - 10, commonly shorter tiian 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. Baldwinii, 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. R. eiliata, Vahl. Culms blunt-angled (l°-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 ; 



