130 PROCEEDINGS OF THE AMERICAN ACADEMY 



somewhat 3-nerved, mucronate, the sides light chestnut-colored, the 

 margins paler and membranaceous : perigynium (immature) little 

 longer than the scale, sessile, oblong-lanceolate, compressed-trigonous, 

 smooth, the orifice obliquely truncate and reddish yellow : stigmas 

 three. — So. Mexico, Valley of Mexico, Dr. J. G. Schaffuer. 



B. Rupestres, Tuckerman, Enum. Meth. 8. (Obtusatce, Tuckm. 1. c.) Peri- 

 gynium mostly ovate and appressed to the rhachis. 



214. Carex pedata, Wahl. Fl. Lapp. 239, t. 14. 



Densely cespitose : culms stiff, one to five inches high, very obtusely 

 angled, smooth, longer than the numerous erect or recurved leaves : 

 spikes two to four, the terminal staminate and a fourth inch or less 

 long, the others pistillate and contiguous, very small, one to five-flow- 

 ered, sessile or very nearly so, borne in the axil of a very short bract 

 wliich has a dilated, colored, and loosely clasping base : perigynium 

 small, broadly round-ovate, rather thin in texture, nerveless, pale 

 below, abruptly contracted into a stout purple often hyaline-tipped 

 beak, usually a little longer than the very obtuse purple and thin 

 margined scale. Transition to the Digitatas. The Carex pedata of 

 LinnjEus, Sp. PI. ed. iii. 1384, is not identified. — Greenland, Fries^ 

 Andersson. N. Europe. Asia. 



215. Carex obesa, Allioni, var. minor, Boott, 111. 161, t. 535. 

 C. supt'na, Willd. ; Wahl. Kongl. Acad. Handl. xxiv. 158. 

 0. Schkuhrii, Willd. Sp. PI. iv. 264. 



C. sphmrocarpa, Willd. 1. c. 265. 

 Distinguished from the last by its mostly larger size, sharply angled 

 culm, thicker pistillate spikes, hard and conspicuously angled peri- 

 gynium, which is usually shorter than the acute scale. — Bear Lake, 

 British America, Richardson, and Saskatchewan, Bourgeau, according 

 to Boeckeler; Greenland, Herh. Europe. Asia. 



216. Carex obtusata, Liljeblad, Kongl. Acad. Handl. 1793, 69, t. 4. 

 C. spicata, Schkuhr, Riedgr. 11, f. 15. 



C. microcephala, C. A. Meyer, Ledeb. Fl. Alt. iv. 205. 



C. qflnis, R. Br., Frankl. Narr. App. 763. 



C. Backlana, Dewey, Sill. Journ. xxix. 250. 



C obesa, var. monostachya, Boeckeler, Linntea, xli. 185. 

 Colorado, Hall & Harbour 606; South Park, Wolf 1003; George- 

 town, Patte7-son ; Little Belt Mts., Montana, 7,500 ft. alt., Scribner ; 

 Saskatchewan, Bourgeau, etc., and northward. 



217. Carex rdpestris, Allioni, Fl. Ped. ii. 264, t. 92, f. 1. 

 C petrcea, Wahl. Kcingl. Acad. Ilandl. xxiv. 139. 



