CTPERACE^. (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. R. Torreyiina, Gray. Cdm nearly terete, slender ; leaves bristle-form i 

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

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

 tubercle. — Swamps ; pine ban'eus of New Jersey, and southward. 



3. B. incxpdnsa, Yahl. Cuhn triangular, slander ; leaves narrowly lin- 

 ear ; spikes spindle-shaped, mostly pedicelied, 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. 



* # Acheniurn smooth and even, lenticvldr. 

 f- Bristles of the perianth denticulate or barbed upwards. 



4. B. fusca, Roem. & Scliultes. 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- 

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

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



5. B« gra.cil£nt£lt Gray. Leaves narrowly linear ; spikes ovoid, in 2-4 

 small clusters, the lateral long-peduncled ; achenium ovoid, rathei- 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. 



■I- 4- Bristles denticulate or barbed downwards (m No. 9 both ways). 



6. B. dlbaf Vahl. Leaves almost bristle-form; spikes (whitish) several in u 

 corymbed cluster, lanceolate ; achenium ovoid, naiTOwed 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. B« CSipillacea« Torr. Leaves bristle-form; spikes 3-6 in a terminal 

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

 chestnut-color, i' 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. K-Ilieskfirnii, 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. — Culms 

 tufted, 6' -18' high, slender. 



9^ jj, glomcrata* 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 soutliward. — Culm 



jo_20 high. A state with small panicled clusters is R. paniculata. Gray. 



43 



