548 CYl'KKACE.K. (SKPOE FAMILV.) 



9. S. atrovircns, .Muhl. Culin 2°-4^ ImkIi, ohtuse-anplpii : loavfs pule, 

 6"- 10 ' wide ; iiiiil)el ereit ; dusters of spikes elosely packed in liir^o jrieeii- 

 isli brown heads ; scales oblong, ])<iinloil ; bristles rather longer tiian the wiiite 

 conipresseil ol)()vate jminted nut, naked lielow tiie middle. — Marsiies and 

 wet banks in the npper districts. July. 



10. S. divaricatUS, Kll. ('nlm rumid ani:;lod, many-juinted ; leaves flat, 

 broailly linear; umbel larj^e, widely s]>readin;^ or dru(jpiiig, decompuund, 

 longer tiian the .'Meaved involucre; spikes all single, oi)lon{^-linear, scattered : 

 scales ovate, obtuse, 3-nerve(l, brown on the sides ; bristles iiair-like, rather 

 roughened than hispid, crisped at the summit, longer than the obovale pointed 

 oqual-sideti, acute-angled nut. — Muddy banks of the C-hipola Hiver, and of 

 Flat Creek, near Aspalaga, Florida to South Carolina ; not common. Au- 

 gust. — Culm 2° -4° higli, often proliferous at the j(jints. Umbel 6' -12' 

 long. Sjjikes 2"-3" long. 



11. S. ( ?) SUbmersus, Sauvalle. Culm floating, terete, sheathed; um- 

 bel large, dccom])ound, leafy, the leaves short, capillary, clustereil like tiie 1- 

 flowered pedicelled spikes; scales two, linear, the lower empty ; style 2-cleft; 

 nut obovate, lenticular, puncticulate, pointed by the persistent liase of the 

 st^'le, shorter than the 6-10 capillary liristles. (Websteria linmopliila, iS. //. 



Wiifjht.) — I^akes and pond.s, Volusia County, Florida {G. W. [Vebster). — 

 Culm 1 ° - 3° loug. Leaves 1' - 3' long. Spikes 4" - 6" long. 



* * Bristles 6, rapil/ari/, smooth, crisped and entaiKjItd. ('rrichopliorum.) 



12. S. Eriophorum, Michx. Culm nearly terete, with the joints re- 

 mote ; leaves linear, elongated, keeled ; umbel terminal, decompound, sjjread- 

 ing or recurved, shorter than the 3-5-leaved involucre; spikes single or 

 clustered, ovate ; scales thin, lanceolate, obtuse ; bristles many times longer 

 than the oblong compressed-3-angled beak-pointed nut, at length exserted, and 

 covering the spike with woolly down. — Swamps and low grounds, Florida, 

 and northward. July - Sept. — Culm 2°- 4° high. 



13. S. lineatus, Michx. Culm 3-angled ; leaves flat, linear-lanceolate ; 

 umbels lateral and terminal, longer than the 1 - 3-leaved involucre ; spikes all 

 single, cylindrical ; scales rigid, keeled, mucronate ; bristles barely exserted ; 

 nut as in the preceding. Swamps, Georgia, and northward. June -August. 

 — Culm 2° - 3° high. Spikelets 3" - 4" long. 



§ 3. Cidms jointless : leaves radical : spikes capitate : involucre several-Ieived. 



14. S. Cubensis, Poepp. & Kunth. Culm acutely 3-angular, leafy at 

 base (8'- 12' high), shorter than the leaves and the involucre; spikes obo- 

 vate, compressed, 1 2-flowered, closely packed in a terminal globular head; 

 scales rigid, oblong-obovate, tapering into a stout spreading point, 13-nerved; 

 stamens 3 ; style deeply 2-parted ; nut ovate-lanceolate, acuminate, concavo- 

 convex ; bristles none. — Marshes, New Orleans (Dr. Hale), Mobile (Mokr). 



9. ERIOPHORUM, L. Cotton-Grass. 



Spikes many-flowered. Scales imbricated in many rows. Perianth com- 

 posed of numerous (rarely 6) smooth and flat hairs, much longer than the 



