524 CYPERACE.E. (SEDGE FAMILY.) 



of the style (tubercled). Perennials, with jointed and leafy culms. Spikes 

 small, disposed in axillary and terminal corymbs or clusters. 



1. ERIOCH^ETE. Bristles of the perianth 6, plumose. 



1. B. plumosa, Ell. Culms (6' -12' high) and leaves filiform; spikes 

 few, in about three small clusters at the summit of the culm ; nut nearly globu- 

 lar, strongly wrinkled, pointed with the short ovate smooth tubercle ; bristles 

 rather longer than the nut, plumose throughout or nearly to the summit. Low 

 pine barrens, Florida to North Carolina. June and July. 



Var. intermedia. Culms taller (l-2 high); leaves narrowly linear; 

 clusters 4-6, forming an interrupted spike at the summit of the culm ; nut obo- 

 vate, pointed with the conical-beaked pubescent tubercle ; bristles plumose only 

 at the base, or below the middle. Sandy pine barrens, often dry places, Florida. 



2. B. semiplumosa, Gray. Culms erect, rigid (l-2 high); leaves 

 narrowly linear ; spikes oblong-ovate, dark brown, crowded in a terminal head, 

 or rarely in a remote axillary one ; nut globose-obovate, faintly wrinkled, pointed 

 with the short broadly conical smooth tubercle ; bristles exceeding the tubercle, 

 plumose below the middle. Dry sandy ridges, near the coast, West Florida. 

 July and Aug. The leaves, like those of the preceding species, have a joint- 

 like contraction near the middle. 



3. B. Oligantha, Gray. Culms (6' -12' high) and smooth leaves bristle- 

 like, reclining ; corymb terminal, of 3 - 6 large (4" long) ovate-lanceolate whitish 

 stalked spikes ; nut oval, lenticular, faintly wrinkled ; tubercle dilated at the base, 

 conical, flat ; bristles longer or shorter than the nut, plumose below the middle. 



Low open pine barrens, Florida to North Carolina. June and July. 



2. EHYNCHOSPORA PROPER. Bristles of the perianth 3-20, smooth, 



scabrous, or hispid. 



* Nut transversely wrinkled or uneven : bristles denticulate or hispid upward. 

 1- Bristles shorter than the nut. 



4. B. rariflora, Ell. Culms and leaves bristle-form; corymbs 2-3, re- 

 mote, spreading ; spikes few and scattered, ovate ; nut broadly obovate, bicon- 

 vex, strongly wrinkled, twice as long as the 6 fragile bristles ; tubercle flat, 

 broadly conical, J as long as the nut. Low grassy pine barrens, Florida to 

 North Carolina. June and July. Culms l-l long, commonly reclining. 

 Spikes pedicelled. 



5. B. Torreyana, Gray. Culms erect, slender, nearly terete ; leaves nar- 

 rowly linear or bristle-form ; corymbs 1-3, remote, erect ; nut obovate, flat, about 

 twice as long as the 6 bristles ; tubercle compressed-conical, dilated at the base, 

 J the length of the nut. Wet ground, South Carolina, and northward. July. 



Culm 1- 3 high. Corymbs many-flowered and somewhat spreading, or 

 few-flowered and capitate. 



6. B..cymosa, Nutt. Culms (2 -3 high) 3-angled; leaves narrowly 

 linear ; corymbs mostly 3, distant, open or contracted ; spikes ovate, clustered, 

 light brown ; scales mucronate ; nut broadly obovate, biconvex, faintly wrinkled, 

 twice as long as the 3-6 bristles ; tubercle broadly conical, compressed, as 



