4. Eriophorum Le Cotton Grass, 
Ferennial bog herbs with rootstocks, the stems erect, slender, 
Se-angled, the leaves linear, Sheathing, the uppermost sometimes reduced 
to sheathing scales, Flowers perfect, in terminal spikes, these in an 
umbel, subtended by several leaf-like bracts, or solitary and naked, Scales 
spirally arranged, overlappinge Perianth of numerous soft bristles which 
are very prominent in fruit, forming a cottony tuft about the achenes, 
Stamens 1-3, Style 3-cleft, Achene S-angled, ovoid, 
© Spikelet Solitary, not: subtended by bracts; bristles brovmish 
4 at maturity i. E. Chamissonis 
0 Spikelets 2—several in en umbel, subtended by several 
4 leaflike bracts; bristles white at maturity 
‘ 
«  Achene obovoid, obtuse; bristles less than 15 mm, ; 
long f£e E. viridi-carinatum 
2  Achene linesr-oblong, acute; bristles more than 
& 15 m, long Se E. tenellun 
1. EK. Chamissonis ieee? Wee Meyer A stoloniferous herb 30-60 cmetall, the 
Bt ie 
stems erect, Smooth; basal leavesgy soft, 15-30 cm, tall, sheathing, grooved 
eee 
on the upper surface, the upper leaves scale-like, sheathing for 4.5 CMe, 
the free portion 1-1,5 em. longs; spikelet erect, without subtending bracts, 
the scales ovate-lanccolate, acuminate, purplish-brown with whitish margins 
bristles numerous, 2-2,5 cm. long and brownish toward the base at maturity; 
eet 
achene oblong-ellivtical, apiculate at the ADEX, “£25 mm, long, 
Subalvine bog, Snovr Peak, 6000 fte, Hpling & Houck 10339, 
3 
