576 CLX. CYPERACE^E. CAREX, 



1. Perigynium cup-shaped, lobed, repand or annular. 



1. S. RETICULARIS. Michx. 



St. 1 2f high, triangular, rather slender ; Ivs. 1" wide, channeled, radical 

 6 12' long, cauline few, much shorter ; fascicles 2 5, lateral and terminal, 

 distant, loose-flowered, subsessile ; spikelets somewhat in pairs, the <? many- 

 flowered, at the base of the $ ; glume light brown, ovate, acuminate ; sta. 2 ; 

 perig. 3-lobed; ach. globose, of a dead white, f" diam., conspicuously reticulated 

 and deeply pitted. Borders of ponds, R. L, Olney ! to Flor. The achenium is 

 a curious and beautiful object. 



2. S. LAXA. Torr. (S. reticularis. Muhl.} 



St. 1 2f high, weak, diffuse, acutely triangular, slender ; Ivs. flat, 2" 

 wide, smooth ; fascicles about 3, one terminal, the others lateral and very re- 

 mote ; ped. 2 6" long, compressed, slender, often recurved ; spikelets distant, in 

 pairs, the sterile at the base of the $ ; sta. 2 ; perig. deeply 3-lobed ; ach. about 

 1" diam., globose, whitish, marked with brown, hairy, transverse ridges and 

 pits. Near the sea coast, N. J. to Flor. Sept. 



3. S. PANUIFLORA. Muhl. 



St. 10 16' high, triangular, slender, smoothish; Ivs. narrow, nearly 

 smooth ; sheaths pubescent ; fascicles 2 3, lateral and terminal, few-flowered, 

 the lateral ones on long peduncles ; bracts foliaceous, ciliate ; spikelets in pairs ; 

 glumes membranaceous, acute ; 9 spikelet of 3 ovate, mucronate glumes, some- 

 what ciliate on the keel ; sty. 3-cleft ; ach. globose, rough, white and shining ; 

 perig. a narrow ring upon which are 6 roundish, minute, tubercles. N. Y. 

 (Bradley}, N. H. (Carey), to Car. Aug. 



/?. Fascicle solitary, terminal, (apparently lateral) sometimes with a small 

 one near the base of the stem. Ohio, Sullivant ! 



4. S. TRIGLOMERATA. Michx. Whip-grass. 



St. erect, acutely triangular, rough, leafy, 3 4f high ; Ivs. linear-lanceo- 

 late, rough-edged ; spikelets lateral and terminal, alternate, in about 3 subsessile 

 fascicles, and much shorter than the leafy bracts ; glumes ovate, cuspidate, dark 

 purple ; ach. globose, smooth and polished, white, nearly 2" diam. when ripe. 

 Swamps, in nearly all the states. June, July. 



2. HYPOPORUM. Perigynium 0. 



5. S. VERTICILLATA. Muhl. (Hypoporum verticillatum. Nees.) 



St. 6 8 12' high, triquetrous, slender, glabrous ; Ivs. linear, narrow and 

 flat, shorter than the stem ; fascicles 4 6, sessile, few-flowered, appearing as if 

 verticillate ; bracts minute, setaceous, about as long as the fascicles, scabrous 

 upward ; scales of > ovate, smooth, scabrous and keeled ; ach. globose, rugose, 

 a little more than ' diam., abruptly mucronate and somewhat 3-sided at base. 

 Very abundant in Junius, N. Y., Sartwell, to Car., W. to Ohio, Sullivant ! 



TRIBE 4. CARICEJE. Flowers diclinous. Scales of the spikes imbricated 

 on all sides. Achenium wholly enclosed in an urceolate or bottle-shaped 

 perigynium. 



18. CAREX. * 



Spikelets 1 or more, either androgynous (with both staminate and 

 pistillate flowers), or with the two kinds in separate spikelets, rarely 

 dioecious ; glumes single, 1 -flowered, lower ones often empty ; sta- 

 mens 3 ; stigmas 2 or 3; perigynium of various forms, 1-valved, per- 

 sistent, enclosing the lenticular or triangular achenium. 

 I. Stigmas two. Achenium double convex. 

 A. Spike single. 1. Monoecious. 



1. C. CAPITATA. 



Spike capitate or nearly globose, <$ at the summit ; fr. (perigynium} round- 

 ish-ovate, close, compressed, convex-concave, glabrous, acutish, longer than the 

 ovate and rather obtuse glume ; Ivs. slender. Heights of the White Mts., Bobbins. 



* By Prof C. Dewey, D. D. See Preface. 



