CYPERACEAE (SEDGE FA:\[ILY) 



203 



333. S. paucif., 

 V. kansana. 



Var, kansana Femald. Very slender and pubescent ; each 

 pair of tubercles bearing a smaller intermediate one. — Sandy soil, 

 Cherokee Co., Kan. Fig. 333. 



4. S. ciliata Micbx. Usnally coarser, 

 0.5-1 m. high, glabrous, or slightly pubescent 

 below ; leaves firm, 1-2.5 ram. wide, becoming 

 revolute ; fascicles 1 or 2, usually solitary, 0.7-2.5 cm. long ; 

 bracts ciliate ; scales smooth; achene 2-3 mw. in diameter, 

 the disk bearing 3 broad shallow entire or barely notched 

 tubercles. — Fine-barrens, etc., Va. and 

 Mo. to Ela. and Tex. July, Aug. 

 (W. I.) Fig. 334. 



5. S. Elli6ttii Chapra. Coarser and 

 lower, 3-5 dm. high ; the culms and flat 

 leaves (2.5-6 mm. icide) pubescent; 

 fascicles 2 or 3, usually subapproximate, 



forming an interrupted head. 1.5-3.5 cm. long; bracts 



coarsely ciliate; scales ciliate on the back; achene with 



3 low broad tubercles, each '2-lobed. — Pine-barrens and 

 dry ground, Va. and Mo., south w. May- 

 July. (W. I.) Fig. 335. 



334. S. ciliata. 



* * * Achene reticulated or wrinkled. 



385. S. Elliottii. 



0. S. reticularis Michx. Culms slender, 



erect, smooth (1.5-7 dm. high); leaves linear (1.5-4 mm. wide), 



smooth ; lateral fascicles 1-3, loose, remote, nearly erect, 07i 



short often included peduncles; bracts glabrous; 



achene globose, regularly reticulated and pitted, 



the pits often vertically arranged, not hairy, resting 



upon a double greenish conspicuously 3-lobed 



disk, the inner appressed to and deciduous with the 33- g ^.^xx^^ 



achene. — Damp sand and pine-barrens, local, e. y^ pubescens! 



]Mass. to Fla. ; n. Ind. Aug., Sept. Fig. 336. 



^ . , . Var. pubescens Britton. Culms weak, diffuse, 0.3-1 m. 



66b. b. reticularis. ^^.^^^^ slightly scabrous or smooth ; leaves linear (2-7 mm. wide), 



smooth ; lateral fascicles loose, on more or less elongated and drooping filiform 



peduncles; achene irregularly pitted-reticulated or pitted-rugose with the ridges 



oftpn someichat spirally arranged and more or less hairy. {S. Tor- 



reyana Walp. ; S. trichopoda C.Wright.) — Pine-barrens, etc., Ct. 



and Ind. to Fla. and Tex. (W. I.) Fig. 337. 



7. S. verticillata Muhl. Smooth ; culms simple, slender (1-9 

 dm. high); leaves narrowly linear; fascicles ^-^, few-flowered, ses- 

 sile in an interrupted spike; achene globose, somewhat triangular 

 at base, rough-iorinkled vnth short elevated ridges ; disk obsolete. — 

 Pine-barrens, damp sand, and wet rocks, Mass. to Ont., Minn., and 

 south w. July-Sept. (W. I.) Fig. 338. 



17. KOBRESIA Willd. 



Spikelets unisexual and one-flowered, or with two flowers (one 

 000 o *• pistillate, one staminate) in short spikes aggregated in elongate 



000. o. V6rtl- — ■ • " — . ,. 



ciliata. 



heads or panicles ; the pistillate flower consisting of a spathiform 

 glume (homologous with the perigynium of Carex) wrapping about 

 the base of the achene and subtended by the scale of the spikelet. — Perennial 

 herbs of northern regions, resembling the first group ( Vigneae) of Carex, but 

 with the perigynium replaced by the open glume which has its margins connate 

 at base. (Named for von Kobres, a nobleman of Augsburg and patron oi 

 botany in Willdenow's time.) 



1. K. elachycarpa Fernald. Densely tufted ; the wiry compressed culms 2-5.S 



