Monograph of North American Rhynchospora. 207 
culate. Glumes fuscous, scarious, acute ; the outer ones ovate ; the 
inner ones ovate-lanceolate. Bristles 6, filiform, minutely hispid up- 
ward, about twice as long as the nut ; the 3 exterior ones somewhat 
shortest. Stamens 3. Stjjle undivided ; the whole indurated and 
persistent, hispidly scabrous upward; when mature, nearly four times 
the length of the obovate, compressed nut. 
Hab. " Leverett Pond," near Amherst, Massachusetts, Prof. 
Hitchcock; New Bedford, Mr. Thomas A. Greene. 
Obs. This species and the preceding, to which it is closely 
allied, differ in habit from the other North American species ; 
they also have simple and entirely persistent styles, and 
might perhaps be referred to the genus Cephaloschoenus of 
Nees von Esenbeck.* 
15. Rhynchospora dodecandra, Baldw. 
R. paniculis corymbosis, laxiusculis ; spiculis ovato-lanceolatis ; 
staminibus duodenis ; nuce oblonga, leevi, tuberculum sub- 
hemisphericum longe excedente ; setis sursum hispidulis nu- 
cem aequante. 
R. dodecandra, Baldw. Mss. et Herb. ! 
Culm triquetrous, 2 feet or more in height. Radical leaves not seen. 
Cauline leaves equalling the culm, rigid and subcoriaceous, 3 — 4 lines 
wide, smooth, a little scabrous on the margin. Panicles 5 — 6, lateral 
and terminal, on peduncles twicethelengthof the sheaths, corymbose, 
loosely flowered ; the lateral ones simple ; the terminal one compound, 
or with two or three clustered together at the summit of the culm. 
Spikelets ovate-lanceolate, sessile and pedicellate. Glumes chesnut 
coloured. £m<!fs 6, equalling the nut, minutely hispid upward. Sta- 
mens 10 — 12. Anthers long-linear, orange-red. Style bifid. Nut 
{immature) oblong, somewhat attenuated downward, smooth or slightly 
corrugated longitudinally. Tubercle short, hemispherical, somewhat 
compressed, as wide as the summit of the nut. 
* Cephalosch(enus. Spicules hermaphrodite. Stylus simplex. Peri- 
gynium setosum, setis antrorsum denticulatis aut hirsutis. Caryopsis styli 
basi persistente discretaque rostrata. Nees, Cyp. Indies I. c. p. 71. 
Vol. III. 27 
