574 CLX. CYPERACE. RHYNCHOSPORA. 
12, PSYLOCARYA. Torr, 
Flowers %. Glumes 00, imbricated all around, all fertile; peri- 
ynium 0; stam. 2; filaments long, persistent ; style 2-cleft, dilated 
or tuberculate at base; achenium biconvex, crowned with the per- 
sistent style—Stems leafy. Spikes lateral and terminal, cymose. 
P. scirpéipes. Torr. 
St. slender, leafy, smooth, 3-sided, 5—9’ high; Jlwvs. linear, smooth, 3—5’ 
by 1”, cauline about 2; cymes terminal, and one from the sheath of each cau- 
line leaf; spikes about 3’ long, oblong-ovate, in small, loose clusters, = 
flowered ; glumes chestnut-colored, thin, ovate, acute; ach. tumid, dark brown, 
crowned with the long style, which is much dilated at base.—Borders of ponds, 
Smithfield, R. I., Olney! Mass., Greene. Rare. 
13. RHYNCHOSPORA. Vahl. 
Gr. pvvxos,-a beak, oropa, seed; from the eharacter. 
Flowers § or d & Q, few in each spikelet ; glumes loosely imbri- 
cated, the lowest small and empty; perigynium of 6—12 bristles; 
stam. 3; style bifid; achenium lens-shaped or subglobose, crowned 
with the distinct, bulbous base of the style-——% Stem leafy, 3-sided. 
Inflorescence terminal and axillary. 
* Achenium smooth. 
1, R. atpa. Vahl. (Scheenus albus. Linn.) White Bog-Rush. 
St. triangular above, very slender, leafy, smooth, 10—16’ high; Jvs. seta- 
- teous, channeled; corymbose fascicles pedunculate, both terminal and from the 
axils of the sheaths, with setaceous bracts; spikelets lanceolate, acute at each 
end, with crowded, lanceolate, white glumes.—In wet, shady grounds; com-~— 
mon. July—Sept. 
2. R. capituacea. Torr. (Scheenus. Mui.) 
St. 6—12’ high, filiform, glabrous, triangular ; lws. setaceous, much shorter 
than the stem; spikelets 3—6, mostly terminal, oblong, each with a setaceous 
bract; glumes chestnut-colored, with scarious edges; bristles 6, much longer 
than the oblong, substipitate achenium; tubercle about half the length of the 
achenium.—Swamps, N. Y., Sartwell, Penn., MuAl. 
3. R. rusca. Rem. & Schult. (Scheenus fuscus. Linn.) 
St. 3-angled, about 2f high; Jvs. linear, carinate, smooth ; fascicles alter- 
nate, pedunculate ; bracts setaceous, longer than the ovoid spikes; glumes brown, 
ovate; ach. brown, rugose, with an acute, black tubercle as long as the hispid 
bristles.— Wet places, Mass. to N. J. Rare. 
4. R. eracitenta. A. Gr. 
St. 1—2f high, very slender or filiform, smooth; Js. linear-setaceous, 
much shorter than the stem; corymbs small, fasciculate, the lateral on slender 
alana exserted from the sheaths; spikelets ovoid; glwmes ovate, acute, dark 
rown ; bristles 6,a third longer than the roundish-ovoid achenium; dwercle 
flat, dilated at base.—Dry grounds, N. Y. to Car. 
5. R. euomerata. Vahl. (Scheenus. Linn.) 
St. slender, smooth, leafy, a foot or more high; Ws. flat, carinate, rougn- 
edged; corymbed fascicles very remote, in pairs, axillary and terminal ; spikelets 
lanceolate ; glumes keeled, mucronate, brown ; ach. obovoid or cuneiform, very 
smooth, as long as the tubercle; sete 6, rough, backwards.—In bogs, Can. to 
Flor. July, Aug. 
6. R. cepHaLantTHa. A. Gr. 
St. 2—83f high, triangular, stout; Zvs. linear, very narrow, the lower and 
radical nearly as long as the stem; hds. roundish, axillary and terminal, soli- 
tary or rarely two together; spikelets lance-oblong; glwmes ovate-oblong, dark 
brown ; bristles 6, twice longer than the achenium ; ach. roundish-ovoid, a little 
compressed, very obtuse.—N. J. pine barrens. ™ 
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