NEw OR CRITICAL SPECIES OF ACER. 
For about a half century past, it has been the received opinion 
that certain maples mostly of low and bushy habit, occupying our 
western mountain districts all the way from the borders of 
Mexico to Alaska, and from the Rocky Mountains to the Pacific, 
were all to be referred to one species, Acer glabrum of Torrey. 
That view has long seemed to me unsupported; and a some- 
what careful examination of the copious material in my own . 
herbarium, supplemented by that of the Canadian Geological 
Survey, has convinced me of the thorough validity of Hooker’s 
A. Douglasii, An inspection of some originals of Nuttall’s 4, 
tripartitum preserved in the herbarium at the New York Botani- 
cal Garden, has led to the reinstatement, in my mind, of that 
species. Certain others are here to be named and defined as new. 
A. SUBSERRATUM. Evidently more than a mere bush, doubt- 
less a small tree, the long wand-like branches with a smooth 
dark-red bark, the internodes 3 or 4 inches long; leaves of 
broadly ovate-trigonous outline, 2 to 4 inches long, nearly as 
wide, broadest in the middle, truncate at the “aie base, not 
deeply 3-lobed, the lobes triangular, the middle one twice or 
thrice as large as the others, the whole margin rather evenly 
serrate-toothed, petioles slender, about as long as the blade; 
peduncles and pedicels of about equal length in fruit and the 
whole little surpassing the petioles: fruits 3 to 6, their wings 
(in half-grown state) little divergent, the sinus bet weet them 
oblong. 
This species, as to my herbarium, rests on a part of Mr. 
Heller’s n. 3,089 from Lewiston, Idaho, 20 May, 1896, the 
specimens showing foliage nearly full grown, and tolerably well _ 
developed though immature fruit. The species excellently 
Prrronta, Vou. V. Pages 1-82. Issued 9 Sept., 1902. 
