ADDITIONS AND CORRECTIONS 1113 



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2-5 mm. wide; spike 5-8 cm. long; internodes longer than the lowest floret; 

 spikelets solitary at the nodes, 1.5 cm. long, excluding the awns; glumes 

 lanceolate, with 2 or 3 unequal awns, the longest 3.5 cm. long; lemma 10-12 

 mm. long; awn slender, 5 cm. long, Arid places: Calif. Ida. 



99 After S. basalticcla insert : 



15a. Sitanion jubatum J. G. Smith. Stem stout, 6-9 dm. high) 

 smooth; sheaths hirsute or the upper minutely pubescent; ligules cartila- 

 ginous, 1 mm. long; leaf -blades linear-lanceolate, 10-18 cm. long, 3-5 

 mm. wide, strigose-pubescent; spike 1-2 dm. long; glumes 4, 3-many-parted, 

 the lobes 1-10 cm. long; spikelets 2 at each node, 2-4-flowered, the lowest 

 flower sterile; body of the lemma linear-lanceolate, 8-10 mm. long, 5- 

 nerved, 3-fid at the apex, the middle awn spreading, 8-12 cm. long. Arid 

 places: Wash. Ida. My. 



99 For ELYMUS read ELYMUS. 

 124 After C. angustior insert.' 



32a. Carex cephalantha (Bailey) Bickn. Culms slender but stiff, 

 2.5-7.5 dm. high; leaf-blades 1.5-2.25 mm. wide, light green; spikes 

 3-7, more or less strongly separate, several-many-flowered; scales ovate, 

 sharp-pointed, as long as body of perigynia, yellowish brown tinged, 

 the midvein prominent to apex; perigynia w'dely spreading at maturity, 

 ovate, 3.5-4 mm. long, many-nerved ventrally, strongly serrulate, con- 

 tracted into a strongly bidentate beak half as long as the body. Dis- 

 tinguished from Car j- <in</ustiorby the wider, more strongly serrulate 

 and more strongly nerved and shorter beaked perigynia and by being 

 a larger plant in every way. Sphagnum bogs and thickets: Newf. Md. 

 Wash. B. C. Boreal. My Jl. 

 126 After C. Egglestonii insert: 



48a. Carex arapahoensis Clokey. In small clumps, the culms 

 stiff, 2-4 dm. high; leaf-blades flat, 1.5-3 mm. wide, long-attenuate; 

 spikes 3-5, densely aggregated, ovoid, 8-12 mm. long, 4-8 mm. wide, 

 rounded or very short-tapering; bracts short, very conspicuously hyaline- 

 margined; scales thin, nearly concealing the perigynia, chestnut-brown 

 with hyaline margins; perigynia ascending, ovate, 4.5-5.25 mm. long, 

 2-2.25 mm. wide, thin, brownish -black, finely nerved on both sides, 

 abruptly contracted into the flat, serrulate, conspicuously hyaline-tipped 

 bidentate beak. Distinguished from No. 48 by the smaller hyaline-tipped 

 perigynia and from No. 49 by the serrulate flat beaks of the perigynia 

 and the flat leaf-blades. High mountains: Colo. Alp. Suhalp. Jl An. 

 131 After C. Rossii insert: 



85a. Carex pityophila Mackenzie. Densely cespitose, the root- 

 stocks stout; culms slender, up to 15 cm. high; leaf-blades 0.75-1.5 mm. 

 wide; staminate spike few-flowered, 4-8 mm. long, 1.5 mm. wide; lowest 

 bract leaflet-like, normally exceeding culm, purplish-tinged at base; 

 upper pistillate spikes very few-flowered, the lower basal; perigynia 

 3.5-4.5 mm. long, 1.75 mm. wide, the body oval, suborbicular in cross- 

 section, the beak smoothish except at the base, obliquely cleft, shallowly 

 bidentate. Differs from Carex Rossii in the smoothish beaked, obliquely 

 cleft perigynia and very few-flowered upper spikes. Dry pine lands: 

 Colo. Utah. N. M. Submont. Ap My. 



133 After C. blanda insert: 



97a. Carex plantaginea Lam. Culms 2.5-6 dm. high, strongly 

 purplish-tinged at base; sterile shoots elongated, their leaf-blades 1-2.5 

 cm. wide, long-persistent, those of the fertile culms rudimentary ; sta- 

 minate spike strongly peduncled, 1-2 cm. long, the scales strongly purplish- 

 tinged; pistillate spikes usually three, linear, 1.5-2.5 cm. long, loosely 

 4-12-flowered, widely separate, the lower erect, exsert-peduncled; 

 bract-sheaths purplish; perigynia oblong-obovoid, 4-5 mm. long, tri- 

 angular, finely many -nerved, the beak nearly straight, 1 mm. long; scales 



