550 CYPEKACE^E. (SEDGE FAMILY.) 



1. T. autumnalis, Nees. Culms slender, flat, 2-edged, 6'- 12' high. 



tufted ; involucre 2-leaved, mostly shorter than the simple compound or de- 

 compound umbel ; spikes linear lanceolate ; scales ovate-lanceolate, mucrouate, 

 imbricated in 4 rows ; stamens 2 ; nut white, obovate, obtuse, often warty, 

 (Scirpus autumnalis, L.) Low grounds, very common. July -Oct. (f). 



2. T. miliacea, Nees. Culm weak, compressed-4-angled (6' -12' high) ; 

 leaves ensiform, straight, erect ; umbel decompound, spreading ; spikes small 

 (1" wide), globular, the scales oblong, obtuse, 3-nerved ; nut obovate, roughish. 



Bogs and ditches, Florida. 



12. ISOLEPIS, R. Br. 



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

 anth none. Style 3-cleft, the tumid base persistent at the apex of the 3-angled 

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

 leaves. Spikes umbelled or clustered. Leaves radical. 



* Spikes umbelled or solitary. 



1. 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-flowered ; 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, hispid on the edges, the sheaths bearded at the throat ; 

 umbel compound ; spikes several (!" 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. August - Sept. 



3. I. coarctata, Torr. Culms (lhigh) terete, filiform; leaves bristle- 

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

 (3" long) linear-oblong, 10- 15-flowered ; scales ovate, acutish, imbricated in 

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

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



Kays of the umbel |' long. 



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

 leaf at the base, csespitose; spike solitary, apparently lateral, ovate, G- 8-flow- 

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

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



* * Spikes clustered in a terminal he.tul. 



5. I. Stenophylla, Torr. Culms (2' -4' high) densely tufted, 3-angled, 

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

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

 oblong-linear, 8-10-flowered; scales lance-ovate, slender-pointed, hispid on 



