(SEDGE FAMILY.) 505 



length of the bristles, four times the length of the depressed-conical tubercle. 

 Low grounds, New Jersey to Virginia, and southward. 



2. B. Toireyana, Gray. Culm nearly terete, slender; leaves bristk-form ; 

 cymes panicled, somewhat loose, the spikes mostly pediceUed ; achenium oblong-obo- 

 vate, longer than the bristles, thrice the length of the broad compressed-conical 

 tubercle. Swamps ; pine barrens of New Jersey, and southward. 



3. B. iiH'\g>:iiisa, Vahl. Culm triangular, slender; leaves narrowly lin- 

 ear ; spikes spindle-shaped, mostly pedicelled, in drooping panicles ; achenium oblong t 

 half the length of the slender bristles, twice the length of the triangular-sub- 

 ulate tubercle. Low grounds, Virginia and southward. 



# # Achenium smooth and even, lenticular. 

 H- Bristles of the perianth denticulate or barbed upwards. 



4. B. fit scsi, Roem. & Schultes. Leaves bristle-form, channelled; spikes 

 ovate-oblong, few, clustered in 1-3 loose heads (dark chestnut-color) ; achenium 

 obovate, half the length of the bristles, about the length of the triangular-sword- 

 ghaped acute tubercle, which is rough-serrulate on the margins. Low grounds, 

 New Jersey to New Hampshire : rare. July. Culm 6' - 12' high. (Eu.) 



5. B. gracileilta, Gray. Leaves narrowly linear; spikes ovoid, in 2 - 4 

 small clusters, the lateral long-peduncled ; achenium ovoid, rather shorter than the 

 bristles, about the length of the flattened awl-shaped tubercle. Low grounds, 

 S. New York, New Jersey, and southward. Culm very slender, l-2 high. 



-*- *- Bristles denticulate or barbed downwards (in No. 9 both ways). 



6. B* alba, Vahl. Leaves almost bridle-form ; spikes (whitish) several in a 

 corymbed cluster, lanceolate ; achenium ovoid, narrowed at the base, shorter than the 

 9-11 bristles, a little longer than the slender beak-like tubercle ; stamens usually 

 anli/ 2. Bogs; common eastward (both north and south) and northward. 

 Culm slender, 12' -20' high. (Eu.) 



7. B. capillacea, Torr. Leaves bristle-form; spikes 3-6 in a terminal 

 cluster, and commonly 1 or 2 on a remote axillary peduncle, oblong-lanceolate (pale 

 chestnut-color, J' long) ; achenium oblong-ovoid, stipitate, very obscurely wrinkled, 

 about half the length of the 6 stout bristles, and twice the length of the lanceolate- 

 beaked tubercle. Bogs and rocky river-banks, Pennsylvania to New York and 

 Michigan. Culm 6' - 9' high, slender. 



8. B. Kllieskemii, Carey. Leaves narrowly linear, short ; spikes nu- 

 merous, crowded in 4-6 distant clusters, oblong-ovate (chestnut-color, scarcely 1'' 

 long) ; achenium obovate, narrowed at the base, equalling the 6 bristles, twice the 

 length of the triangular flattened tubercle. Pine barrens of New Jersey, on 

 bog iron-ore banks exclusively (Knieskern), and southward; rare. Culm* 

 tufted, 6' - 18' high, slender. j 



9. B. glomerata, Vahl. Leaves linear, flat ; spikes numerous in distant 

 clusters or heads (which are often in pairs from the same sheath), ovoid-oblong 

 (chestnut-brown) ; achenium obovate, margined, narrowed at the base, as long 

 as the lance-awl-shaped flattened tubercle, which equals the (always) downwardly 

 barbed bristles. Low grounds, Maine to Kentucky, and southward. Culm 

 l-2 high. A state with small panicled clusters is R. paniculata, Gray. 



43 



