CYPERACEAE (SEDGE FAMILY) 



203 



Var. kansllna rernald. Very slender and pubescent; mch 

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

 Cherokee Co., Kan. Fig. 333. 



4. S. ciliata Michx. Usually coarser, 

 0.5-1 m. high, glabrous, cr slightly pubescent •^•^^- °- P'»"'^'f-i 

 below ; leaves firm, 1-2.5 mm. wide, becoming ^' '^*"®*°*- 

 revohite ; 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. Elli6ttii Chapm. Coarser and 

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



334. S. cUiata. 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. 



335. S. Elliottii. 



336. S. reticularis. 



e. 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, 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 33/y^ g ^^^c... 

 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. 

 high, slightly scabrous or smooth ; leaves linear (2-7 mm. wide), 

 smooth ; lateral fascicles loose, on more or less elongated and drooping Jil if orm 

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

 often somewhat spirally arranged and more or less haii'y. (^S. Tor- 

 reyana Walp. ; S. trichojmda 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 shoft elevated ridges; disk obsolete. — 

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

 southw. July-Sept. (W. I.) Fig. 338. 



17. KOBRESIA Willd. 



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

 ^ pistillate, one staminate) in short spikes aggregated in elongate 



a. verti- j^^g^^g ^^ 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) o( 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 of 

 botany in Willdenow's time.) 



1. K. elachycdrpa Fernald. Densely tufted ; the wiry compressed culms ^-«.o 



