CYPERACE.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. R. Torreyana, Gray. Culm nearly terete, slender ; leaves bristle-form ; 

 cymes panicled, somewhat loose, the spikes mostly pcdicdled; 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. R* inexpansa, 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. 

 *- Bristles of the perianth denticulate or barbed upwards, 



4. R. fit sea, 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- 

 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. R. gracilenta, 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. R. alba* Vahl. Leaves almost bristle-form; spikes (ichitisli) seceral in a 

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

 9-11 brisllcji, 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. R. 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, ' long) ; achenium oblong-ovoid, stipitate, very obscurely wrinkled, 

 about half the length of t.Jie 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. R. liBicskri'lii 9 Carey. Leaves narrowly linear, short ; spikes me- 

 mcrous, 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. R. gloilierala, Vahl. Leaves linear, fat ; 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 

 barbid bristles. Low grounds, Maine- to Kentucky, and southward. Calm 

 l-2 high. A state with small panicled clusters is R. paniculaia, Uruy, 



43 



