364 



CYPERACE.E. 



Rhynchospora. 



long as the lanceolate-rostrate tubercle. — Torr. fl. 1. p. 55 ; Gray, Rhynch. I. c. no. 25, and 

 in Torr. Cyp. p. 366 ; Kunth, enurn. 2. p. 302. Schoenus setaceus, Muhl. gram. p. 6. 



Culm 6-12 inches high, very slender, smooth. Leaves setaceous, channelled. Spikelets 

 oblong-lanceolate, about 2-flowered ; the terminal ones mostly three ; the lateral ones often 

 solitary, from the sheath of the uppermost leaf. Scales light brown, oblong, mucronate, keeled. 

 Bristles 6, stout. Stamens 3. Achenium attenuated into a short stipe at the base. Tubercle 

 slender and acute. 



Swamps, Putnam county (Dr. Barratt) ; Penn-Yan, Yates county (Dr. Sarhvell). Lime- 

 stone rocks, Jefferson county (Dr. Gray). Cranberry marsh near Oneida lake (Dr.Knieskern). 

 Fl. July. 



3. Rhynchospora fusca, Roem. Sf Schult. Brown Beak-rush. 



Culm obscurely triangular, striate ; leaves setaceous, channelled ; clusters of spikelets 

 1 -» 3, somewhat capitate ; achenium obovate, somewhat tumid, a little narrowed at the base, 

 about half as long as the upwardly hispid bristles, and about the length of the slender acute 

 tubercle, which is serrulate-scabrous on the margin. — Rcem. <£- Schult. syst. 2. p. 81 ; Hook, 

 brit. fl. (ed. 4.) 1. p. 25 ; Gray, Rhynch. I. c. no. 26, and in Torr. Cyp. p. 366 ; Kunth, 

 enum. 2. p. 295. R. alba, var. fusca, Vahl, enum. 2. p. 236. Schoenus fuscus, Linn. sp. 

 (ed. 2.) 2. p. 1664. 



Culm 8-12 inches high, very slender, smooth. Fascicles of spikelets in rather close heads. 

 Scales dark brown and shining, mucronate. Bristles 6, very slender, minutely hispid ; three 

 of them longer than the others. Stamens 3. Achenium smooth, but rather uneven. Tubercle 

 much compressed, broad at the base, tapering to a long acute summit. 



Genesee county (Dr. Bradley) ; Moriches, Long Island (Dr. Knieskern). A native also of 

 Europe. 



4. Rhynchospora gracilenta, Gray, Tall Blender Beak-rush. 



Culm and leaves very slender ; clusters of spikelets 2-4, small, somewhat crowded, the 

 terminal one nearly sessile , lateral ones on exserted peduncles ; achenium smooth, ovoid- 

 lenticular, shorter than the upwardly hispid bristles, and about the length of the slender 

 acuminate tubercle. — Gray, Rhynch. I. c. no. 27, and in Torr. Cyp. p. 367 ; Kunth, enum. 

 2. p. 540. 



Culm 1-2 feet high, almost capillary, obscurely triangular. Leaves linear- setaceous. 

 Spikelets small and few-flowered, ovoid, sometimes in a single terminal head, but usually with 

 one or two smaller lateral clusters also. Glumes ovate, acute or mucronate, fuscous. Bristles 

 6, about half as long again as the achenium, minutely hispid upward. Stamens 3. Tubercle 

 subulate from a broad base. 



Philipstown, Putnam county (Dr. Barratt). 



