SEDGE FAMILY 



331 



128. Carex atrosquama Mackenzie. 

 Black-.^caled Sedge. Fig. 804. 



Caie.v atrosquama Mackenzie, Proc. Biol. Soc. Wash. 25: 51. 1912. 

 Carc.v apoila Clokey .\ni. Joiirn. Sci. \'. 3: 88. 1922. 



Densely cespitose, the culms 2-4.5 dm. high, ph\'llopodic, slender, 

 erect or the apex nodding, sharply triangular, purplish-brown 

 tinged and slightly tibrillose at base. Leaf-blades deep green, 2.5- 

 3.5 mm. wide ; spikes 3 or 4, approximate or the lower slightly 

 separate, the upper sessile or nearly so, the lower on erect peduncles 

 half to twice their length, oblong, 6-12 mm. long, 5 mm. wide, 

 densely 15-30-flowered, the terminal gynaecandrous, the lateral 

 staminate ; lowest bract slightly sheathing, shorter than to exceed- 

 ing inflorescence ; scales broadly ovate, obtuse or acutish, shorter 

 than perigynia, black, the midvein obsolete ; perigynia narrowly 

 obovoid, 3.25 mm. long, 1.75 mm. wide, slightly inflated and subtri- 

 angular, olive green, membranaceous, nerveless, puncticulate. 

 granular roughened above, glabrous, round-tapering at base, ab- 

 ruptly beaked, the beak purplish black, 0.5 mm. long, shallowly 

 bidentate ; acher.es triangular, short-stipitate ; style slender, 

 jointed with achene; stigmas 3. 



Mountain meadows. Canadian Zone; Alberta and Montana to British Co- 

 lumbia and Washington. Tyi)e locality: Smoky River, Alberta. 



129. Carex albonigra Mackenzie. 

 Black and \\'hite-.scaled Sedge. Fig. 805. 



Carex albonigra Mackenzie, in Rydberg, Fl. Rocky Mts. 137. 1917. 



Densely cespitose, the culms 1-2.5 dm. high, stiff, rigid and 

 erect, sharply triangular, roughened above, purplish-brown 

 tinged and but slightly tibrillose at base. Leaf-blades not 

 glaucous, 3 mm. wide, flat with revolute margins ; spikes mostly 

 three, approximate or lowest slightly separate, the lowest short 

 peduncled, the others sessile or nearly so, the lateral pistillate, 

 narrowly oblong, 8-10 mm. long, 4 mm. wide, with about 8-15 

 appressed perigynia, the terminal gynaecandrous, longer, clavate 

 at base ; lowest bract about equalling inflorescence, sub-sheath- 

 ing; scales broadly ovate, obtuse or acutish, nearly length of 

 perigynia, black with conspicuous shining white margins, the 

 midvein more or less obsolete ; perigynia broadly ovate, much 

 flattened, 3 mm. long, 2 mm. wide, blackish, membranaceous, 

 nerveless, puncticulate, glabrous, minutely roughened on margins 

 above, rounded at base, very abruptly contracted into a shallowly 

 bidentate beak scarcely 0.5 mm. long; achenes triangular, short 

 stipitate, much narrower than perigynia; style slender, jointed 

 with achene: stigmas 3, short. 



^lountain meadows at high altitudes. Transition and Candiana Zones; 

 Montana to Washington, south to Colorado and Arizona. Type locality: 

 Xeedle Mountain, \\'yoming. 



130. Carex viridior Mackenzie, n. sp. 



:^ig. 806. 



Fl. Rocky ]\Its. 137 (in part). 



Greener Sedge. 



Carex atratiforinis Mackenzie in Rydberg 

 1917; not Brit. 



Rootstocks slender, short-creeping, the culms loosely cespi- 

 tose, 4-7 dm. high, slender but erect, sharply triangular, smooth 

 'jr little roughened, phyllopodic, purplish tinged at base. Leaf- 

 lilade? 2.5-4 mm. wide, flat with revolute margins, green, not at 

 all glaucous, the sheaths white hyaline ventrally ; spikes 3 or 4. 

 the terminal ovoid, gynaecandrous, clavate at base, the lateral 

 pistillate (with a very few staminate basal flowers), oblong or 

 linear-oblong, 1-2 cm. long, 4-5 mm. wide, closely 20-40-flowerod, 

 the upper approximate and short peduncled, the lower more or 

 less strongly remote and on erect sharply triangular peduncles 

 one-half to twice length of spikes ; lowest bract purplish black 

 tinged at base, sheathless, nearly equalling culm ; scales exceed- 

 ing perigynia, brownish black with obsolete midvein, obtuse or 

 acutish ; perigynia obovate or oblong-oval, 3.5 mm. long, 2 mm. 

 wide, much flattened, rounded at base, nerveless, granular rough- 

 ened above, yellowish brown tinged, meml)ranaceous, abruptly 

 beaked, the beak 0.25 mm. long, bidentulate ; achenes triangular, 

 one-third to one-half width of perigynia, slenderly long stipitate; 

 style very slender, straight, jointed with the achene; stigmas 3. 

 short. 



Mountains from Alberta and Montana to Washington. Type: Sheep 

 Mountain, Okanogan County. Washington, Eygleston 3329. 



