STANDLEY — ^FLORA OF GLACIER PARK. 295 



1. ERIOPHORTJM L. Cottongrass. 



Glabrous perennials; leaves linear, the stem leaves often reduced to sheaths; 

 spikelets 1 or few, the scales spirally arranged; perianth of 6 scales, but these divided 

 into numerous long, soft, white or brownish bristles; achenes narrow, 3-angled. 



Spikelet one on each stem 1- E. chamissonis. 



Spikelets several 2. E. angustifolium. 



1. Eriophorum chamissonis Mey. Bog below Lake McDermott; sphagnum bogs 

 on the west slope. Alaska to Oreg., Wyo., and N. B.; also in Eur. and Asia.— Stems 

 20 to 60 cm. high, slender; bristles usually brownish, about 2 cm. long. 



The silky heads are very handsome and conspicuous. 



2. Eriophorum angustifolium Roth. Wet meadow below Grinnell Glacier. Alaska 

 to Oreg., N. Mex., 111., and Newf.— Plants slender, 30 to 60 cm. high; leaves 3 to 6 

 mm. wide; bracts often blackish; bristles white or brownish. 



2. ELEOCHARIS R. Br. Spikerush. 



Glabrous perennials; leaves represented only by sheaths; spikelet 1, erect, the 

 scales spirally arranged; perianth of few bristles; achene 3-angled or lenticular, the 

 base of the style persistent as a tubercle. 



Achene whitish, with longitudinal ribs 1- E. acicularis. 



Achene yellow or brownish, not ribbed. 



Style branches 2; stems 1.5 to 2 mm. thick 2. E. palustris. 



Style branches 3; stemsabout 0.5 mm. thick 3. E. tenuis. 



1. Eleocharis acicularis (L.) Roem. & Schult. Low open ground, east entrance. 

 Widely distributed in N. Amer., Eur., and Asia.— Stems very slender, 2 to 15 cm. 

 high; spikelets 3 to 6 mm. long, the scales brownish. 



The plants often form dense mats. 



2. Eleocharis palustris (L.) Roem. & Schult. Occasional at low or rarely at 

 middle altitudes, in wet soil. Widely distributed in N. Amer., Eur., and Asia.— 

 Plants rather stout, 15 to 60 cm. high, green or somewhat glaucous; spikelets 6 to 20 

 mm. long, the scales purplish brown; achene yellowish, with a large tubercle. 



3. Eleocharis tenuis (Willd.) Schult. Wet meadow below Grinnell Glacier. Sask . 

 to Colo., Fla., and N. S.— Stems 5 to 30 cm. high, green; spikelets 3 to 10 mm. long; 

 achenes yellowish brown, roughened, with a small tubercle. 



3. DULICHIUM L. Rich. 



1. Duliohium arundinaceum (L.) Britton. Sphagnum bogs on the west slope. 

 B. G. to Tex., Fla., and Newf.; also in Centr. Amer.— Perennial, 30 to 60 cm. high, 

 with rootstocks and slender hollow leafy stems; leaves linear, 2 to 8 cm. long, 

 spreading; spikelets 12 to 20 mm. long, in axillary spikes. 



4. SCIRPXJS L. 



Glabrous perennials; leaves linear, often reduced to sheaths; spikelets few or 



many, clustered, ovoid, the scales spirally arranged; perianth of few bristles. 



Stems 3-angled, leafy; spikelets very numerous, in large umbels . 1. S. microcarpus. 



Stems round, not leafy; spikelets few, in a loose cluster, this appearing to rise from 



the side of the stem near the top 2. S. occidentalis. 



1. Scirpus microcarpus Presl. Banks at Johns Lake; low places about east 

 entrance. Alaska to Calif., N. Mex., Conn., and Newf.— Plants 0.5 to 1 meter high; 

 leaves long, rough-edged; spikelets greenish, 3 to 4 mm. long, in dense clusters, these 

 arranged in umbels; achenes wliitish. 



2. Scirpus occidentalis (S. Wats.) Chase. Bulrush. About ponds on prairie at 

 east entrance. B. C. to Calif., N. Mex., Mo., N. Y., and Newf.— Stems about a 

 meter high, dark green, soft and spongy; leaves all reduced to sheaths at the base 

 of the stem; spikelets 6 to 15 mm. long, brown. 



