CTPEKACE.E. (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. K. TorreyfiBia, Gray. Culm nearly terete, slender ; leaves bristle-form ; 

 cynics panicled, somewhat loose, the spikes mostly pedicelled ; 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. K. illCXgKtllsa, Vahl. Culm triangular, slender; leaves narrowly lin- 

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

 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. 



-t- Bristles of the perianth denticulate or barbed upwards. 



4. K. fYssca, Rcem. & Schultes. Leaves bristle-form, channelled; spikes 

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

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

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

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



5. K. gH'iiCiii'UiSl, Gray. Leaves narrowly linear; spikes ovoid, in 2-4 

 small clusters, the lateral long-pcduncled ; 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. 



+- -t- Bristles denticulate or barbed downwards [in No. 9 both ways). 



6. B. saltoa. Vahl. Leaves almost bristle-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 

 only 2. — Bogs; common eastward (both north and south) and northward. — 

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



7. St. capiHf«cea, 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, \' long) ; achenium oblong-ovoid, stipitatc, very obscurely wrinkled, 

 aboi'.t 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 G'-S' high, slender. 



8. St. I£.BlIeslcerJlBi, 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 tlie 6 bristles, twice the 

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

 bog iron-ore banks exclusively (Knieskent), and southward ; rare. — Culms 

 tufted, 6' - 18' high, slender. 



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

 clusters or heads (which are often iu 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. paniculala, Gray. 



43 



