a snseon er 
3. Be pumila L. var. glandulifera Regel. Clump Birch. A clump type 
shining, the lower paler and dotted with glands, the veins minutely reticulate, 
2. Be fontinalis Sargt. Spring Birch. A smll graceful tree, 5-6 m 
tall, or shrubby, forming open clumps or frequently thickets; bark bronze or 
chestnut color to clay color, marked by conspicuous horizontal lenticels , » 
peeling and separating into thin layers but not readily; branchlets drooping, 
finely hairy and warty with numerous glands; leaves 2.5-4 cm. long, broadly oe 
ovate or subrotund, obtuse or acute at the apex, rounded, subtruncate or broadly 
cuneate at the base, rather sharply toothed, the teeth triangular, 1-2 mm, Roe 
long, both surfaces resinous and villous when unfolding, becoming glabrous, pee 
or nearly so, dull green above, paler and yellowish-green below, minutely om 
glamiular dotted, petioles glandular dotted, about 1 cm. long, slender; stam- 
inate catkins pendulous, 4-6 cm. long, the bracts resinous, hairy, abruptly 
acuminate at very tip, mature pistillate catkins 1.5+2 cm. long, cylindrical, 
on peduncles 2-3 mm. long, bracts ciliate on the margin and puberulous, 35.5 mm. 
long; nutlet oval, the wings obcordate, the notch shallow or wanting, each 
wing about equal in width to the nutlet. —piBs microphyl ia Bunge ). 
4 
Occasional in the open broader valleys below 5000 feet. 
“ 
of shrub 2-3 me tall, stems numerous, ascending; bark dark chestnut-brown 
at the base, peeling only with difficulty, branchlets puberulent and 
glandular-warty, ascending; leaves commonly 1-5-4 cme long, those on suckers 
frequently longer, thickish ani leathery, obovate or oval, very obtuse or 
rounded, commonly cuneate at the base, the upper surface dark green and 
margins crenately toothed, the teeth blunt and rounded, petiole 3-6 mm. long; 
mature pistillate catkins 1.5-2 em. long, cylindrical, on glandular peduncles 
5-6 me long, bracts ciliate on the margins, the lobes blunt, subequal; nutlet 
oval, 1.5 mm. long, the wings not cordate at the apex, each one scarcely the 
width of the nutlet. 
Sphagnum bogs at elevations of 2500-4000 feet or more; infrequent but 
abundant locally. —— 
>Priest Lake, Piper 3739; Upper Priest Lake, Epling 7745; near Oxford 
Ranger Station 4000 ft., Epling and Houck 9681; Lamb Cr. 3000 ft., Spling and 
Houck 10232. 
= 
