200 



CYPBEACEAB (SEDGE FAMILY) 



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

 involute-filiform ; cymes panicled, somewhat loose, the 

 ing brown spikelets mostly pediceled; achene 

 compressed, oblong-obovoid, longer than the 

 bristles, thrice the length of the broad com- 

 pressed-conical tubercle. — Swamps and bogs. 

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

 tine-barrens of N. J. to Ga. July-Oct. Fig. 

 317. 



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

 triangular, slender ; leaves narrowly 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 



81T. K. Torreyana. triangular-subulate tubercle. — Low grounds, 

 Va. to Ga. July-Sept. Fig. 318. 



; leavei 

 ascend- 



* * Achene smooth and even. 



318. 1^. iDexpansa. 



819 

 8. 



leaves 



821. K. 



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- 

 void, about J the length of^the bristles, nearly 

 equaling the triangular-sword-shaped acute 

 tubercle, which is rough-serrulate on the mar- 

 gins. — -Boggy places, Nfd. to Ont., s. to Del. 

 K. lusoa. and Mich. July-Sept. (Eu.) Fio. 319. 

 R. gracil^nta Gray. Culms very slender, 3-8 dm. high ; g^o e "i-acilenta 

 narrowly 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 gi-ounds, s. N. Y. and N. J. to Fla. Aug., Sept. (W. I., 

 S. A.) Fig. 320. 



9. R. oligdntha 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, Aug. 

 oligantha. FiG. 321. 



H- •<- Bristles none, or 1-3 and minute; spikelets pale, 1-flowered. 



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

 triangular ; leaves and spikelets as in the next species, but only 

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

 reddish-tawny ; 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. 



. B. pallida. 



•1- ■(- -1- Bristles long, denticulate downward, or both ways in no. 15. 



++ Spikelets white or whitish, becoming tawny with age, perfecting only a single 

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



11. R. dlba (L.) Vahl. Culm slender (1.5-6 dm. high), triangular above; 

 leaves narrowly linear or almost bristle-form ; spikelets lanceolate, densely 

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

 two lateral ones ; achene oblong-obovate with a narrowed base, scarcely longer 

 than the flattened-awl-shaped tubercle, shorter than the bristles, — Bogs, Nf(J. 



