Four new North American birches 
N. L. BritTTon 
; 
Betula Utahensis sp. nov. 
Young twigs densely resinous-glandular, greenish-brown, be- 
coming bright brown and shining. Young leaves hairy on both 
sides, the older ones glabrous, except for a few hairs on the veins 
beneath, ovate to ovate-orbicular, sharply dentate with abruptly 
tipped teeth, acute, 5 cm. long or less and sometimes as wide as 
long, narrowed or truncate at the base, the upper surface dull 
green ; staminate catkins 5 cm. long or longer ; strobiles cylindric, 
stout, 3-4 cm. long, more than 1 cm. thick, borne on stalks about 
6 mm. long, their scales nearly as wide as long, finely pubescent 
and ciliate, the lateral lobes obliquely-ovate, widely spreading and 
about as long as the triangular-lanceolate, pointed, middle one ; 
nut obovate, 2 mm. long, narrower than its wings. 
Type specimens collected in City Creek Cajion, Salt Lake City, 
by S. G. Stokes, 
This appears to differ markedly from Setula fontinalis by its 
very thick strobiles and the widely spreading lateral lobes of 
| their scales. 
Betula Piperi sp. nov. 
This tree is described by Professor Piper as attaining a height 
Of 15 m. and being slender and graceful, with drooping branches, 
and dark bronze bark which does not peel off readily. The young 
twigs are very slender, green and glandular; leaves ovate, thin, 
Sharply irregularly serrate, acute, 5 cm. long or less, broadly to 
Narrowly cuneate at the base, pubescent when young, glabrous or 
nearly so and shining on the upper surface when mature ; petioles 
'~2 cm. long; stipules ovate, about 5 mm. long; staminate cat- 
Kins 6-8 cm. long ; strobiles narrowly-cylindric, 3-5 cm. long, 
about 8 mm. thick, stalked, their scales about 6 mm. long, rather 
longer than wide, 3-lobed at the top, puberulent and ciliate, the 
lateral lobes widely spreading and obtuse, about as long as the 
Narrower, acute, middle one, the stalk-like base of the scale cun- 
fate ; nut 1.5-2 mm. long, obovate to oblong, wider than its wing. 
Type collected by Professor C. V. Piper, July 9, 1901, nine 
Miles south of Pullman, Washington. 
165 
