Mackenzie : Notes on Carex 479 



peduncle about 8 cm. long, the upper panicles in pairs, shorter- 

 peduncled, the panicle bracts leaflet-like, strongly sheathing; 

 panicles ovoid, 1.5-4.5 cm. long, 1-2 cm. wide, containing 6-12 

 sessile and sometimes somewhat compound widely spreading 

 spikes ; spikes 4-7 mm. long, 3.5-6 mm, wide with 5-12 pistillate 

 flowers at base and with a few very inconspicuous staminate flow- 

 ers at apex, which are usually exceeded by the perigynia; lower 

 scales frequently empty ; spathella prominent ; bracts usually 

 scale-like, but occasionally 3-15 mm. long; scales ovate, very 

 obtuse, or rarely awned, brown with lighter center and hyaline 

 margins, the pistillate half the length of the perigynia; perigynia 

 3-3.5 "^^- long, 1.2 mm. wide, the body obovoid, sharply trian- 

 gular, green, rather faintly nerved, tapering to a substipitate base, 

 abruptly contracted at apex into a somewhat roughened and 

 slightly bent beak i mm. long, with bidentate apex ; achenes tri- 

 angular, 2 mm. long, closely invested by perigynia ; stigmas three. 



Type, C- G. Pringle's ^Sjg, collected August 19, 1894, Sierra 



de San Felipe, Oaxaca, Mexico, 7,500 feet, distributed as Carex 



Wahl 



University. 



The following key will serve to distinguish this species from 

 its allies : 



Perigynia 4.5-5 mm. long..... C, macrospervia, 



Perigynia 2.5^4 mm. long. 



Scales generally very obtuse, brown ; spikes short, oblong or sub- 

 orbicular ; perigynia sides weakly nerved C. fitscotincta. 



Scales acuminate to cuspidate, green or straw-colored ; spikes ob- 

 long to linear-oblong; perigynia sides strongly nerved...... C dadosiachya. 



Carex perstricta sp. nov. 



w 



Culms densely tufted from thick matted rootstocks, phyllo- 

 podic, 2.5-5 c^'"- high, exceeding leaves, smooth or nearly so on 

 angles, prominently fibrillose at base. Leaves with well-developed 

 blades six to ten to a fertile culm, mostly clustered at the base, the 

 blades 1.5 mm. wide or less, the margins strongly revolute, glau- 

 cous, usually 1-2 dm. long, much roughened ; spikes 5-7, androg- 

 ynous, forming a head 2.5-5 c"""- ^o"&' ^^^ lower two or three 

 more or less strongly separate and distinct, the upper closely ag- 

 gregated (the lowermost rarely slightly compound), strictly erect, 

 short-peduncled or sessile, linear-oblong, 5-12 mm. long, 2.5-3.5 

 mm. wide and containing 5-12 appressed-ascending perigynia below 

 in few ranks, and with about as many staminate flowers above ; 

 bracts leaflet-like, not sheathing, exceeding the inflorescence; 



