522 CYPERACEJE. (SEDGE FAMILY.) 
long, dark brown; scales smooth, rigid, rounded; nnt obovate, acento, slightly 
furrowed and pitted. (Scirpus castaneus, Michx. $. ferrugineus, Ell.) — Salt 
marshes, Florida, and northward. Aug. - Oct. 
Var. puberula. (Scirpus puberulus, Michx.) Culms single, slender (1°- 
2° high) ; leaves filiform, involute, and, like the spikes, densely pubescent and 
somewhat hoary ; nut round-obovate, obtuse. — Low pine barrens. 
2. F. laxa, Vahl. Annual; culms (6/—18' high) slender, and, like the 
narrowly linear leaves, often pubescent; umbel mostly simple; involucre 2 —4- 
leaved ; spikes oblong-ovate ; scales orbicular, mucronate; nut obovate, strongly 
furrowed and pitted, warty on the edges. (Scirpus sulcatus, Ell.)—Low 
grounds, in fields and waste places, Florida to North Carolina. Aug. and Sept. 
— Umbel occasionally reduced to a single spike. 
* * Spikes clustered, sessile. 
3. F. congesta, Torr. Annual; culms densely tufted (3! - 6! high), bris- 
tle-like, like the rough leaves ; spikes 5-10 in a terminal cluster, oblong or cylin- 
drical, pale, or at length yellowish brown; involucre 4-leaved, erect-spreading, 
longer than the culm ; scales lanceolate, tapering into a slender spreading point; 
nut oblong-obovate, crossed with faint lines, — Banks of the Apalachicola River, 
Florida, and westward, Aug. and Sept. — Spikes 2! — 3! long. 
ll. TRICHELOSTYLIS, Lestib. 
Spikes terete, many-flowered. Scales imbricated in few (4-8) rows. Peri- 
anth none, Style 3-cleft, tumid at the base, deciduous. Nut 3-angled. — Culms 
jointless, leafy at the base. Spikes umbelled. 
1. T. autumnalis. Culms slender, flat, 2-edged, 6/- 12! high, tufted ; 
involucre 2-leaved, mostly shorter than the simple compound or decompound 
umbel ; spikes linear-lanceolate; scales ovate-lanceolate, mucronate, imbricated : 
in 4 rows ; stamens 2; nut white, obovate, obtuse, often warty. (Scirpus autum- 
nalis, L.) —Low grounds, Florida to Mississippi, and northward, very common. 
July-Oct. © 
12. ISOLEPIS, R. Brown. 
Spikes few-many-flowered. Scales imbricated in few — several rows. du^ 
anth none. Style 3-cleft, the tumid base persistent at the apex of the ido 
nut.— All annuals (in our species), with filiform or bristle-form culms anc 
leaves. Spikes umbelled or clustered. Leaves radical. 
5 a A ; : * Spikes umbelled. (Scales pubescent.) 5 pd 3 
1. L capillaris, R. & S. Culm (4/ -6' high) smooth, furrowed, ae! 7 $ : 
uc we rough-edged leaves, bristle-like ; spikes 3—4, in a simple umbel, oblong, 
.. flowered ; scales oblong, obtuse, strongly keeled, brown on the sides, - we ai 
A r Aegon? 
