200 



CYPERACEAE (SEDGE FAMILY) 



Torrej'una. 



5. R. Torreyana Gray. Culm nearly terete, slender 

 invohite-jiUform; cymes panicled, somewhat loose, the 

 iiig brown spikelets mostly pediceled; achene 

 compressed, ohlong-ohovoid, longer than the 

 bristles, thrice the length of the broad com- 

 pressed-conical tubercle. — Swamps and bogs, 

 East Washington, N. H. (C F. Parker) ; 

 pine-barrewi of N. J. to Ga. July-Oct. Fig. 

 817. 



6. R. inexpansa (Michx.) Vahl. Culm 

 triangular^ slender ; leaves narroidy linear, 

 2-3 mm. wide, becoming involute ; spikelets 

 spindle-shaped, mostly pediceled, in drooping 

 panicles; achene oblong, half the length of 

 the slender bristles, twice the length of the 

 triangular-subulate tubercle. — Low grounds, 



; leaver 

 ascend- 



Va. to Ga. July-Sept. Fig. 



318. 



* * Achene smooth and even. 



318. K. inexpansa. 



K. fusca. 



8 

 leaves 



Bristles 6, long and conspicuous, upwardly denticulate. 



7. R. fusca (L. ) Ait. f. Loosely stoloniferous ; culm 2-6 

 dm. high ; leaves bristle-form, channeled; spikelets ovoid- 

 fusiform, few, clustered in 1-4 loose heads (chestnut-color) 

 overtopped by the slender bracts ; achene obo- 

 roid, about ^ the length of the bristles, nearly 

 equaling the triangular-sword-shaped acute 

 tubercle, which is rough-serrulate on the mar- 

 gins. — Boggv places, Nfd. to Out., s. to Del. 

 and Mich. July-Sept. (Eu.) Fig. 319. 

 R. gracilenta Gray. Culms very slender, 3-8 dm, high ; 

 narroidy linear; spikelets ovoid, in 2-4 small clusters, 



the lateral long-peduncled ; achene ovoid, rather shorter than 

 the bristles, about the length of the flat-awl-shaped tubercle. — 

 Low grounds, s. N. Y. and N. J. to Fla. Aug., Sept. (\V. L, 

 S. A.) Fig. 320. 



9. R. oligantha Gray. Culm and leaves filiform, 1.5-4 

 dm. high ; spikelets very few (1-4), ovoid-fusiform ; bristles 

 plumose below the middle; achene obovoid-oblong, bearing a 

 conical tubercle \ its length. — Del. to Fla. July, 

 Fig. 321. 



o-2ii. i; , iri"acilenta. 



Aug. 



321. K. olis^antha 



•^ -t- Bristles none, or 1-3 and minute ; spikelets pale, 1-floicered. 



10. R. pallida M. A. Curtis. Culm (3-8 dm. high) acutely 

 triangular ; leaves and spikelets as in the next species, but o)ily 

 a terminal dense cluster, which is less white or turns pale 

 reddish-tav)ny ; achene obovoid-lenticular, tipped with a minute 

 depressed and apiculate tubercle ; the delicate bristles 4-5 times 

 shorter or obsolete. — Bogs in pine-barrens, N.J. and N. C. 

 Aug., Sept. (W. I., S. A.) Fig. 322. 



322 



pallida. 



Bristles long, denticulate doiomcard, or both xoays in no. 15. 



••-* Spikelets white or whitish, becoming tawny with age, perfecting only a single 

 Jlfjuier ; stamens usually 2 ; bristles 9-12, or even 20. 



11. R. dlba (L.) Vahl. Culm slender (1.5-0 dm. high), triangular above; 

 leaves narr. iwly linear or almost bristle-form ; si)ikelers lanceolate, densely 

 crowded in a head-like terminal corymb (0.5-1.5 cm. broad) and usually one or 

 two lateral (»nes ; achene oblong-obovate with a narrowed base, scarcely longer 

 than the flaltened-awl-shaped tubercle, shorter than the bristles. — Bogs, Ntd 



