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236 BOTANICAL GAZETTE [APRIL 
in. in diameter, covered with brown scaly bark, ascending 
branches, forming a narrow head, and thin branchlets marked 
by many small pale lenticels, dark red-brown when they first 
appear, becoming bright chestnut-brown and very lustrous dur- 
ing their first summer and ashy-gray during their second year, 
and unarmed or armed with very slender straight chestnut-brown 
lustrous spines usually from 3{ to 1 in. in length. 
Flowers about the middle of April. Fruit ripens in August. 
High dry bottom lands of the Trinity river and its branches at 
Dallas, Texas, in forests of Ulmus crassifolia and Celtis Mississip- 
prensis, F. Reverchon, July 1899, B. F. Bush, April 1900. 
Betula Alaskana, n. sp.—Leaves rhomboidal to broadly ovate 
and truncate or rounded at the base, acuminate, very coarsely den- 
tate above the middle with glandular teeth, entire below, more or 
less covered with resinous glands while young, from 1% to 3 in. 
long, from I to 1% in. wide, dark green on the upper surface, 
yellow-green on the lower surface, the slender midribs and 
remote veins puberulous below or ultimately glabrous. Stami- 
nate catkins clustered, sessile, about 1 in. long, % in. thick, their 
scales ovate, acuminate, puberulous, light red, yellow on the 
margins. Pistillate catkins slender, cylindrical, pedunculate, 
about I in. long and % in. thick. Fruiting catkins from 1 to 
1% in. long, from ¥% to % in. thick, their scales about as long 
as broad, ciliate on the margins of the lobes, the central lobe 
acute or acuminate, the lateral lobes erect and acute or spread- 
ing and rounded. 
A tree with close light red bark, usually from 35 to 40 ft. in 
height with a trunk 6 or 8 in in diameter, and occasionally 50 
ft. in height with a trunk a foot in diameter, spreading and pen- 
dulous branches, slender red-brown branchlets more or less ver- 
rucose with conspicuous resinous glands, and obovate obtuse 
winter buds ¥ in. in length. 
Saskatchewan, &. Bourgeau, 18 58 (in Herb. Gray); near 
Prince Albert in latitude 53, July 1876, Yohn Macoun; north- 
westward, reaching the Alaskan coast on the shores of the Lynn 
Canal (Muir, Canby, and Sargent, August 1897); and westward. 

