CYPERACEAE (SEDGE FAMILY) 



203 



Var. kansana Fernald. Very slender and pubescent ; each 

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

 Cherokee Co., Kan. FIG. 333. 



4. S. ciliata Michx. Usually coarser, 

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

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



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

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

 the disk bearing 3 broad shallow entire or barely notched 

 tubercles. Pine-barrens, etc., Va. and 

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

 (W. I.) FIG. 334. 



5. S. Ellidttii Chapm. Coarser and 

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



334. S. ciliata. leaves (2.5-6 mm. wide} 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. 



* * * Achene reticulated or wrinkled. 

 6. S. reticularis Michx. Culms slender, 885. 8. Elliottii. 

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

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

 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 wi ^ IOM ^ 

 achene. Damp sand and pine-barrens, local, e. v pubescens'. 

 Mass, to Fla. ; n. Ind. Aug., Sept. FIG. 336. 

 -a., a Var. pubSscens Britton. Culms weak, diffuse, 0.3-1 m. 



' high, 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 

 often somewhat spirally arranged and more or less hairy. (S. Tor- 

 reyana Walp. ; #. 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 4-6, few-flowered, ses- 

 sile in an interrupted spike ; achene globose, somewhat triangular 

 at base, rough-wrinkled with 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. KOBR^SIA Willd. 



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

 . " ,. pistillate, one staminate) in short spikes aggregated in elongate 

 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 2-6.6 



