550 CYPERACEiE. (SEDOE FAMILY.) 



1. T. autumnalis, Nees. ("ulms .slciidor, flat, 2-e(I<Te(l, 6' -12' liigli. 

 tuftt'd ; iiivohaTo 2-K'iivuii, iiiDStk slmrtcr than tlio siiii]ile t-()iii|)<niiiil oi dc- 

 coniiMiiuid uiiil)el; spikes linear laiiciMjlatu; scales ovate-lanceolate, niucrunate, 

 iniliiicated in 4 rows ; stamens 2 ; nnt white, ohovate, ohtiise, often warty, 

 (Scii|iMs autumnalis, A.) — Low grounds, very common. July -Oct. '^). 



-' T. miliacea, Nees. Culm weak, conij)rt'.s.sed-4-anglcd (6' - 12' high) ; 

 leaves ensiform, straight, erect ; nmliel decompound, sjireading; spikes small 

 (I" wide), glohular, tlie scales uhlong, obtuse, 3-uerved ; nut obovate, roughish. 



— Bogs aud ditches, Florida. ' 



12. ISOLEPIS, H. Br. 



Spikes few -many-flowered. Scales imbricated in few -several rows. Peri- 

 antii none. Style 3-cleft, the tumid base persistent at the ape.x of the ."i-angled 

 nut. — All annuals (in our species), with filiform or bristleform culms and 

 leaves. Spikes umbelled or clustered. Leaves radical. 



* Sjiikes umbelled or solitnri/. 



L I. capillaris, R. & S. Culm (4'-6' high) smooth, furrowed, and, 

 like the rough-edged leaves, bristle-like; spikes .3-4, in a simple umbel, ob- 

 long, 6 - 8-flovvered ; scales oblong, obtuse, strongly keeled, brown on the sides, 

 imbricated in 4 rows; nut obovate, obtuse, nearly equal-sided, transversely 

 wrinkled; stamens 2. — Moist sandy places, Florida, and northward. June- 

 Sept. — Sheaths of the leaves bearded at the throat. Involucre 2 - 3-leaved, 

 scarcely longer than the umbel. 



2. I. ciliatifolia, Torr. Culms tufted, filiform, angled (6'- 12' high) ; 

 leaves bristle-form, liispid on the edges, the sheaths bearded at the throat; 

 umbel compound ; spikes several (l"-2" long), 6- 12-flowered, linear-oblong; 

 scales oval, strongly keeled, brown on the sides ; nut obovate, very obtuse, 

 nearly equal-sided, obscurely wrinkled. — Dry sandy places, Florida to North 

 Carolina. Augi^t - Sept. 



3. I. coarctata, Torr. Culms (1° high) terete, filiform; leaves bri.stle- 

 forin, smooth, with the sheaths bearded ; umbel compound, contracted ; spikes 

 (3" long) linear-oblong, 10- I5-fiowered ; scales ovate, acutish, iml)ricated in 

 4 rows ; nut flat on the inner face, obtuse-angled in front, obscurely dotted. — 

 Dry sandy soil, (Georgia and South Carolina, near the coast. Sept. -Oct. 



— Rays of tlie uml)el I' long. 



4 I. carinata, Hook. & Arn. Culms setaceous, with a single setaceous 

 leaf at the base, (■;es])itose; sjiike solitary, apparently lateral, ovate, 6-8-flow- 

 ered ; scales ovate, acute, strongly keeled, twice as long as the acutely 3- 

 angled roughish nut. — New Orleans {Dr. Hale), and northward. 



* * S/iikes clustered in a terminal head. 



5. I. Stenophylla, Torr. Culms (2' -4' high) densely tufted, .^-angled, 

 and, witli the bristle-form leaves and involucre, bristly -ciliate; involucre much 

 longer than the head, 3-4-leaved, dilated and ciliate at theba.se; spikes 4-6, 

 oblong-linear, 8 - 1 0-flow-ered ; scales lance-ovate, slender- pointed, hispid on 



