576 CLX. CYPERACE^. Carex. 



§ 1. Perigynium cup-shaped, lobed, repand or annidar. 



1. S. RETICULARIS. Michx. 



St. 1 — 2f high, triangular, rather slender; Ivs. l"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 ^ manj'- 

 flowered, at the base of the 5; glume light brown, ovate, acuminate; sta. 2; 

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

 and'deeply pitted. — Borders of ponds, R. I., Oliiey I 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-clell ; 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, Sidlivant ! 



4. S. TRIGLOMERATA. MicllX. WMp-grOSS. 



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, while, 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 ; lis. 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 i' diam., abruptly mucronate and somewhat 3-sided at base. 

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



Tribe 4. CARICEiE. — 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 (witli 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, l-valved, per- 

 sistent, enclosing tlie lenticular or triangular achenium. 

 I. Stigmas two. Acheuium 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. Sre Preface. 



