426 



Butler : The western American birches 



glabrous; samara about 3 mm, wide and as long; nutlet obovate 

 with cuneate base, wing narrower than nutlet. [Figure 3.] 



Type collected by W. T. Home at Karluk, Alaska, in August, 

 1902, and reported as rare. Gorman's }io, iigs, collected at White 

 River, Yukon Territory, near timber line, is probably the same. 



This is closely related to Betida glamhdosa and B.fontinalh, 



1 



Figure 3. Betuhi Homei Butler. 

 From type, IV. T. Home, Karluk, 

 Alaska, 



Figure 4. Beiu/a EI- 



rodiana Butler. From type, 

 B, T. Sutler jog^ near Rest 

 Lake, Montana. 



differing from both in its fruit and leaves and from the latter also 

 I in habit of growth. Type in the herbarium of the N. Y. Botanical 



Garden. 



y 



4. Betula Elrodiana sp. nov. 



A low shrub; stems glabrous, shining, red-brown or dull 

 gray; twigs and branchlets slender, red-brown or gray, pubescent, 

 sparmgly glandular-resiniferous, becoming glabrous ; leaf-blades 

 I7-3 cm. long, 1-2 cm. wide, oval or rhombic, rarely ovate or obo- 

 vate, often suborbicular, with acute, sometimes obtuse apex, and 

 rounded, obtuse, or cuneate, and entire base, crenate-serrate with 

 ovate teeth 1-4 mm. wide at the base, shining dark -green above, 

 reticulated, dull green beneath, glabrous except for a few hairs 

 on the basal margin and along the venation above and beneath, 

 venation not conspicuous, 3-5 pairs of veins ; petioles pubescent, 

 pale brown or green, 5-T0 mm. long; fruiting ament 10-15 mm. 

 long, 6-8 mm. thick, cylindrical or oval on a slender stalk 3-8 

 mm. long; bractlet puberulent and ciliate, 3-5 mm. long, about 3 



