482 Mackenzie : Notes on Carex 



Type in the herbarium of the New York Botanical Garden, col- 

 lected by F, K. Vreeland, no. 1121, in marshy ground at John's 



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Lake, northern Montana, altitude 1050 m., on Aug. 19, 1901. Pro- 



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fessor Umbach's jcj, collected in a peat bog at Lake MacDonald, 

 Montana, on Aug. 20, 1901, is also to be referred to this species. 

 While outwardly resembling Carex IdaJwa Bailey, this species 

 is easily differentiated from that species, as follows: 



Perigynia strongly flattened, many-nerved, beak! ess, 4 mm. long ; scales 



abruptly cuspidate , C. Holniiana, 



Perigynia not flattened, not nerved, beaked, 2.5 mm. long; scales 



acuminate- tapering C Idahoa. 



Named in honor of Dr. Theodor Holm who has done much 



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to make known obscure species of North American Cyperaceae, 

 and who indicated the type specimen as a distinct species several 

 years ago. 



^ Carex Abramsii sp. nov. 



Culms very slender, 4-7 dm. high, phyllopodic, very much 

 exceeding the leaves, somewhat roughened above on the angles, 

 fibrillose at base, the rootstocks slender, elongate. Leaves with 

 well-developed blades seven to fifteen to a fertile culm, mostly 

 clustered near the base, and with the blades flat, 1.75-2.5 mm. 

 wide, 5-15 cm. long, and roughened towards apex, but the two to 

 four upper very widely separated, with elongated sheaths 2-4 cm. 

 long and often with reduced blades ; terminal spike staminate, 

 sessile or short-peduncled, 6-12 mm. long, 2.5-3.5 mm. wide, the 

 scales obovate, obtuse, brownish, with lighter midrib and hyaline 

 margins ; pistillate spikes three or four, erect, the upper approxi- 

 mate and sessile or short-peduncled, the lowest more or less 

 strongly remote and exsert-peduncled, the spikes linear-oblong, 

 staminate at apex, 5-14 mm. long, 2.5-4 mm. wide, and containing 

 5-15 ascending perigynia rather closely packed in few ranks; 

 lowest bract leaflet-like, strongly sheathing, exceeded by inflor- 

 escence,^ the upper bracts much reduced; scales very broadly 

 ovate, obtuse to short-acute, brown with lighter center and broad 

 hyaline margins, wider but slightly shorter than mature perigynia; 

 perigynia 3.5 mm. long, glabrous, tinged reddish brown, the body 

 triangular, obscurely few-nerved on outer and several-nerved on 

 inner face, broadly obovoid, 1.25 mm. wide, tapering to a substipi- 

 tate base, abruptly beaked, the beak i mm; long, somewhat 

 oblique, 2-edged, slightly serrulate, the orifice 2-toothed, somewhat 

 hyaline; achenes triangular, suborbicular, sessile, filling perigynia; 

 stigmas three. 



