CYri.KA* t i. (sedge family.) 525 



long a« rlio nut. — Var. qlobttlabis Smaller (<">'- l.V high) ; corymbs reduced 

 to few globose-ovate dark In-own clustered spikes ; nuts smaller, and deeper fur- 

 rowed. — Low ground, Florida, and northward. June and July. 



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

 ear, rigid; corymbs 8 - 5, remote, spreading ; spikes ovate, numerous, in dense 

 bracted clusters; scales acute; nut obovate; the flat or somewhat depressed 

 sides strongly wrinkled and pitted, twice as long as the 6 bristles; tubercle 

 conical-beaked, with the dilated base wider than the nut. — Margins of pine- 

 barren ponds, West Florida. June and July. — Radical leaves numerous, 1° 

 long. 



■«- -<- Bristles equalling or longer than the nut (in No. 9 variable). 



8. R. stenophylla, n. sp. Culms and leaves setaceous; corymbs 1-2, 

 small, erect; spikes 5-7, distinct, lanceolate-oblong; nut obovate, biconvex, 

 strongly wrinkled, twice as lone,- as the conical-beaked tubercle; bristles 6, slen- 

 der, nearly as long as the nut and tubercle. — Low grassy pine barrens, Apala- 

 chicola. June and July. — Culms tufted, 1° long. 



9. R. microcarpa, Baldw. Culms (2° high) erect, slender, nearly terete ; 

 leaves narrowly linear; corymbs 4-6, slender, spreading, compound; spikes small, 

 round-ovate, scattered; nut round-obovatc, lenticular, strongly wrinkled, tipped 

 with the very short and broad tubercle ; bristles 5 - 6, as long as the nut. — ■ 

 Varies with the spikes clustered, and the 3 bristles not half the length of the 

 nut. — Margins of ponds, Florida to North Carolina. July and Aug. 



10. R. inexpansa, Vahl. Culms nearly terete, slender (2°-3° high); leaves 

 narrowly linear ; corymbs 4-5, narrow, remote, compound, drooping; spikes 

 scattered, lanceolate ; nut lanceolate-oblong, compressed, twice as long as the 

 conical-beaked tubercle ; bristles 6, very slender, twice the length of the nut. — 

 Swamps and banks of streams, Georgia, and northward. July and Aug. 



11. R. decurrens, n. sp. Culms (2° -3° high) erect, nearly terete, very 

 slender and bending near the top ; leaves linear, elongated, flat and somewhat 

 glaucous ; corymbs 5-6, remote, compound, the bristle-like branches spreading 

 or drooping ; spikes (1" long) ovate, scattered, pedicelled ; nut obovate, lentic- 

 ular, slightly wrinkled and pitted; tubercle compressed, crescent-shaped, with 

 the edges decurrent, £ the length of the nut ; bristles 6, as long as the nut. — 

 Marshy banks of lakes and rivers, West Florida. June and July. 



12. R. patula, Gray. Culms 3-angled (2°-3° high), slender above; leaves 

 linear ; corymbs 3-5, remote, compound, widely spreading ; spikes scattered, 

 ovate, on slender stalks ; nut round-obovate, lenticular ; tubercle flat, conical, 

 half the length of the nut, ciliate on the edges ; bristles 6, rather longer than the 

 nut. — Varies with the spikes lanceolate, the narrower nut contracted at the 

 base, and the bristles twice the length of the nut. — Banks of pine-barren 

 streams, Florida and Georgia. June and July. 



13. R. Elliottii, Dietr. Culm (2° -3° high) 3-angled; leaves linear (1"- 

 2" wide) ; corymbs 3-5, compound, the lower ones remote; spikes small, ovate, 

 crowded ; nut obovate, flattened, strongly wrinkled ; tubercle broadly conical, 

 flat, \ as long as the nut ; bristles C, strongly hispid, as long as the nut and 



