200 



CYPEKACEAE (SEDGE FAMILY) 



5. R. Torreyina Gray. Cuhn nearly terete, slender 

 involute-filiform ; cymes panicled, somewhat loose, the 

 ing hvo'^nspikelets 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) ; 

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

 317. 



«.^ „ 6. R. inexpAnsa (Michx.) Vahl. Ctilm 



Wf triangular, slender; leaves narrowly linear^ 



Mi 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, 

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



; leavei 

 ascend- 



317. R. Torreyana. 



* Achene smooth and even. 



818. R. inexpaiisa. 



319. 



8 

 leaves 



BristXes 6, long and conspiciious, upimrdlij denticulate. 



7. R. fusca (L.) Ait. f. Loosely stolon iferous ; culm 2-1 



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



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



overtopped by the slender bracts ; achene obo- 



void, about ^ the length of th/- bristles, nearly 



equaling the triangular-sword-shaped acute 



tubercle, which is rough-serrulate on the mar- 



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



^^•^"''^^- andMjch. July-Sept. (Eu.) Fig. 319. 



R. gracil6nta Gray. Oulms very slender, 3-8 dm. high ; g^^ p^ <r,.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 grounds, s. N. Y. and N. J. to Fla, Aug., Sept. (\V. I., 

 S. A. ) Fig. 320. 



9. R. oligintha 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 i its length. — Del. to Fla. July, Aug. 



oligantha. FiG. 32 L 



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



10. R. pallida 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. L, S. A.) Fig. 322. 



•»-•»-•»- Bristles long, dentictilate dotcnward, or both ways in no. 15. 



•M. Spikelets white or whitish, becoming taxony with age, perfecting only a single 

 flower ; stainens 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 usi.ally 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, Nfd 



821. R. 



822. E. pallida. 



