576 CLX. CYPERACE. CAREX. 
§ 1. Perigynium cup-shaped, lobed, repand or annular. 
1. S. RETICULARIS. Michx. 
S/. 1—2f high, triangular, rather slender; lvs. 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 g’ many- 
flowered, at the base of the %; glume light brown, ovate, acuminate; sta. 2; 
perig. 3-lobed ; ach. globose, of a dead white, 3/’ diam., conspicuously reticulated 
and deeply pitted.—Borders of ponds, R. I., Olney! to Flor. The achenium is 
a curious and beautiful object. ‘ 
2. S. uaxa. Torr. (S. reticularis. Mudl. 
St. 1—2f high, weak, diffuse, acutely triangular, slender; dvs. flat, 2” 
wide, smooth ; fascicles about 3, one terminal, the others lateral and very re- 
mote ; ped. 2—b’’ 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; Jws. 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; Q 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. 
8. 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; dws. linear-lanceo- 
late, rough-edged ; spzkelets 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. vd 
§ 2. Hypoporum. Perigynium 0. 
5. S. verTiciLLATA. Muhl. (Hypoporum verticillatum. Nees.) 
St. 6-—8—12’ high, triquetrous, slender, glabrous; dvs. 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, seabrous 
upward ; scales of 2 ovate, smooth, scabrous and keeled; ach. globose, rugose, 
a little more than 3’ diam., abruptly mucronate and somewhat 3-sided at base. 
—Very abundant in Junius, N. Y., Sartweill, to Car., W. to Ohio, Sullivant! 
Trize 4. CARICEX.—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 
diccious; glumes single, 1-flowered, lower ones often empty ; sta- 
mens 3; stigmas 2 or 3; perigynium of various forms, l-valved, per- 
sistent, enclosing the lenticular or triangular achenium. 
I. Stigmas two. Achenium double convex. 
A. Spike single. 1. Monecious. 
1. C. capirata. 
Spike capitate or nearly globose, } at the summit; fr. (perigyniwm) round- 
ish-ovate, close, compressed, convex-concave, glabrous, acutish, longer than the 
ovate and rather obtuse glume ; /vs. slender.—Heights of the White Mts., Robbins. 
* By Prof. C. Dewey, D. D. Sve Preface. 
