652 CYPEItACK.K. (.SKI)(;K I A.MIl.V.) 



the tubercle, plumose below the middle. — Dry s;uidy ridges near the coast, 

 Floritlii. July- August. — Tiie leaves, like liiose of the jiroLediiig species, 

 have a joiut-like coutractiou uear the middle. 



3. R. oligautha, Gray. Culms (C- 12' high) and smooth leaves bristle- 

 like, reclining; curymb terminal, of 3-6 large (4" long) ovate-lauceolate 

 wiiitisli stalked spikes; nut oval, lenticular, faiutly wrinkled ; tniiercle dilated 

 Jit tiie base, conical, fiat ; bristles longer or shorter tiian the nut, plumo.se be- 

 low the middle. — Low opeu pine barrens, Florida to North Carolina. Juuc- 

 July. 



§ 2. KiiYNCHospoKA prcjpor. — liiistles of the perianth 3-20, smooth, 

 scabious, ur litsjiid. 



* Nut transversely/ wrinkled or uneven: bristles denticulate or hispid upward. 



•^ Bristles shorter than the nut. 



4. R. rariflora, Ell. Culms and leaves bristle-form; corymbs 2-3, re- 

 mote, spreading ; spikes few and scattered, ovate ; nut broadly obovate, bicon- 

 vex, strongly wrinkled, twice as long as the 6 fragile bristles; tubercle flat, 

 broadly conical,^ as long as the nut. — Low 'gra.ssy ])ine i)arrcns. June- 

 July. — Culms 1°- H° l<->ug, commonly reclining. Spikes pedicelled. 



5. R. Torreyana, (Jray. Culms erect, slender, nearly terete; leaves 

 narrowly linear or bristle-form; corymbs 1-3, remote, erect; nut ol)ovate, 

 flat, about twice as long as the 6 bristles; tubercle compressed-conical, ililated 

 at the base, ^ the length of the nut. — Wet ground, South Carolina, and north- 

 ward. July. — Culm l°-3° high. Corymbs many-flowered and somewhat 

 spreading, or few-flowered and capitate. 



6. R, eymosa, Nutt. Culms (2° -3° high) 3-angled ; leaves narrowly 

 linear ; corvmbs mostly 3, distant, open or contracted ; spikes ovate, clustered, 

 light brown; scales mucronate; nut broadly obovate, biconvex, faintly wrin- 

 kled, twice as long as the 3-6 bristles; tubercle broadly conical, compressed, 

 i as long as the nut. — Var. globllaris. Smaller (6'- 15' high) : corymbs 

 reduced to few globose-ovate dark l)r()wn clustered spikes ; nuts smaller, and 

 decjjer furrowed. — Low ground, Florida, and nortlnvard. June- July. 



7. R. compressa, Carey. Culms stout, 3-angled (2°-3°high); leaves 

 linear, rigid: corymbs 3-5, remote, spreading; spikes ovate, numerous, in 

 dense bracted clusters; scales acute; nut obovate; the flat or somewhat de- 

 pressed sides strongly wrinkled and pitted, twice as long as the 6 itristles; 

 tubercle conical-beaked, with tlie dilated base wider than the nut. — Margins 

 of pine barren ponds, Florida. June -July. — Radical leaves numerous, 1° 

 long. 



+- -t- Bristles crpialling or lonrjer than the nut {in No. 9 variable). 



8. R. stenophylla, Chapm. Culms and leaves setaceous ; corymbs 1- 

 2, small, erect ; sjjikes 5-7, distinct, lanceolate-oblong ; nut obovate, Iticonvex, 

 stronglv wrinkled, twice as long as the conical-beaked tubercle; bristles 6, 

 slender, nearly as long as tlie nut and tubercle. — Low grassy jiine barrens, 

 Florida. June - July. — Culms tufted, 1" hmg. 



