CYPERACE^. (sedge FAMILY ) 529 



ami ditches, Florida, and northward. Jidy- Sept. — Leaves l°-2° long. Nut 

 and tubercle nearly 1 ' long. 



2. C. macrostaehyus, Gray, var. patulus. Corymbs very large, 

 decompound, diffuse; style minutely 2-cleft; nut broadly ohovate ; bristles slen- 

 der, twice as long as the nut ; otherwise like No. 1. — Ponds and ditches, Florida, 

 and northward. August. — Culms 3° -4° high. Terminal corymbs often 1° 

 in diameter. 



3. C, capitatus, n. sp. Culms (2° -3° high) nearly terete, straight, like 

 the long narrow erect and channelled leaves; spikes densely clustered in 1-G 

 globular heads, the lateral heads long peduncled and somewhat corymbose ; 

 scales about 9 (the fourth fertile), whitish; style very long, minutely 2-cleft; nut 

 obovate, lenticular, obscurely wrinkled, hispid on the margins above, shorter 

 than the 6 slender bristles ; tubercle bristle-awl shaped, twice as long as the nut. 

 — Pine-barren | omls, IMiddle and West Florida June - Aug. '— Leaves 2"-4" 

 wide, as long as the culm. Head composed of 30 or more spikes. Nut and 

 tubercle 3" long. 



16. CH^TOSPORA, R.Brown. 



Spikes few- (1 -8-) flowered. Scales imbricated in two rows ; the lower ones 

 empty, the upper bearing perfect flowers. Perianth of 3 - 6 scabrous or plumose 

 bristles. Stamens 3. Style 3-cleft, not dilated at the base, nearly deciduous. 

 Nut triangular, mostly pointed by the persistent base of the style. — Leaves 

 radical, narrow. Spikes in a terminal cluster, subtended by a 1 - 2-leaved in- 

 volucre. 



1- C. nigricans, Kunth. Culms tufted, erect, slightly compressed, smooth 

 and rigid, jointed near the summit ; leaves rigid, erect, semi-terete, rough on the 

 margins, shorter than the culms; sheaths black; involucre 2-leavcd, the lowest 

 longer than the ovoid dark brown head; spikes ovate-lanceolate, compressed, 

 6 - 8-flowered ; scales ovate, compressed-keeled, the lowest mucronate ; rachis 

 zigzag; bristles 6, unequal, compressed, dilated at the base, hispid upward, 

 longer than the globose-3-angled white and polished nut. (Schoenus nigricans, 

 L.) — Damp soil, near INIarianna, West Florida, and salt marshes, near St. 

 Mark, Middle Florida. May. y.— Culms 1°- U° high. Altiiough differing 

 in some particidars, the Florida plant is probably not distinct from that of the 

 eastern hemisphere. 



17. PSILOCARYA, Torr. 



Spikes many-flowered, terete. Scales imbricated in several rows, membrana- 

 ceous, all bearing perfect flowers. Perianth none. Stamens 2. Style 2-cleft. 

 Nut biconvex, transversely wrinkled, crowned with the persistent base of the 

 style. — Culms leafy. Spikes ovate, disposed in spreading lateral and terminal 

 corymbs. 



1. P. rhynchosporoides, Ton-. Culms nearly terete (^°-2° high); 

 leaves narrowly linear, longer than the culm ; corymbs 2-3, widely sjjreading, 

 the terminal one mostly compound ; sjjikcs pedicelled ; scales ovate, acute ; nut 



45 



