480 Mackenzie: Notes on Carex 



scales ovate, obtuse or acute, white-hyaline with green center, the 

 pistillate two thirds the length of perigynia ; perigynia 2.5 mm. long, 

 strongly white-scabrous, the body oblong-obovoid, sharply triangu- 

 lar, I mm. wide, nerved, tapering at base, abruptly contracted into a 

 short bidentate beak 0.5 mm. long; achenes triangular, oblong- 

 obovoid, nearly 2 mm. long, closely surrounded by perigynia ; 

 stigmas three. 



Type, C. 



June 5, 1889, moun- 



tains near Monterey, Nuevo Leon, Mexico, named Carex Schied- 

 tana Kunze by Professor L. H. Bailey, and preserved in the her- 

 barium of Columbia University. 



To be distinguished from Carex Schiediana Kunze, to which 

 it is related, as follows : 



Blades 1.5 mm. or less wide, strongly revolute, glaucous; perigynii I 



m 



m. wide..... C perstricia. 



Blades 2-3 mm. wide, flat, green ; perigynia 1.5 mm, wide C Schiedidna. 



-^ Carex nuhicola sp. nov. 



Carex f estiva var. decumbens Holm, Am, Jour. Sci. 166: 20, 26, 



1903. Not Carex^ dectivibens Ehrh. 



In dense clumps, not stoloniferous, nor with long running root- 

 stocks, the culms 12-35 cm. high, aphyllopodic, erect or more or 

 less strongly curving, usually exceedmg the leaves, smooth or 

 nearly so on the angles. Leaves with well-developed blades usu- 

 ally three to five to a fertile culm, clustered near the base, the 

 blades flat, 2-3 mm. wide, 6-12 cm. long, roughened at apex; 

 inflorescence consisting of four to seven spikes densely clustered 

 in an ovoid or globular head 12-18 mm. long and 9-18 mm. 

 wide, the bracts inconspicuous, the upper scale-like, the lower 

 cuspidate-prolonged, usually much shorter than the head; spikes 

 ovoid or subglobosc, 5-9 mm. long, 4.5-8 mm. wide, containing 

 above 15-35 closely packed ascending perigynia with erect or 

 ascending beaks, and below a few inconspicuous staminate flowers ; 

 scales ovate, acute, blackish, with lighter center and hyaline mar- 

 gins, much narrower and shorter than perigynia; perigynia rather 

 narrowly to broadly ovate, very flat and strongly winged, 2-2.75 

 mm. wide, 4,5-5.5 ^^i^- lo^g> rather weakly nerved, blackish or 

 brownish-tinged, rounded at base, serrulate above, abruptly con- 

 tracted into a somewhat bidentate beak about one third the length 

 of whole; achenes lenticular, oblong-obovoid, stipitate, 1.75 mm. 

 long, 0.75 mm. wide; stigmas two. 



This is one of the most marked of the numerous forms which 



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