Monograph of North American Rhynchosporce. 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. Stijle undivided : the whole indurated and 

 persistent, hispidly scabrous upward ; when mature, nearly four times 

 the length of the obovate, compressed nut. 



Hab. " Leverctt Pond," near Amherst, Massachusetts, Prof. 



Hitchcock ; New Bedford, Mr. Thomas A. Greene. 

 Obs. Thi? sp3cie3 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 Cejjhaloschoenus of 



Nees von Esenbeck.* 



15. Rhynchospora dodecandra, Baldw. 



R. paniculis corymbosis, laxiusculis; spiculis ovato-lanceolatis ; 

 staminibus duodenis ; nuce oblonga, Isevi, 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 twice the length of 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. Briit'.es 6, equalling the nut, minutely hispid upward. Sta- 

 mens 10 — 12. Anthers long-linear, orange-red. Style bifid. Nat 

 (immature) oblong, somewhat attenuated downward, smooth or slightly 

 corrugated longitudinally. Tubercle short, hemispherical, somewhat 

 compressed, as wide as the summit of the nut. 



* Cephaloschcenus. Spiculcehermaphroditse. Stylus simplex. Peri- 

 gyniumsetosum, setis antrorsumdenticulatisauthirsutis. Caryopsis styli 

 basi persistente discretaque rostrata. i\"iees, Cyp. Indies I. c. p. 71. 



Vol. hi. 27 



