ACERACE.E 



683 



greenish yellow petals; stamens 7 or 8, with glabrous unequal filaments shorter than the 

 petals, much shorter or rudimentary in the pistillate flower; ovary glabrous, with short 

 obtuse lobes, rudimentary or in the staminate flower; style divided to the base into 2 

 spreading stigmatic lobes as long as the petals. Fruit glabrous, with broad nearly erect 

 or slightly spreading wings t'-' long, often rose-colored during the summer; seeds ovoid, 

 bright chestnut-brown, about ^' long. 



A small tree, occasionally 20-30 high, with a short trunk 6'-12' in diameter, small 

 upright branches, and slender glabrous branchlets often slightly many-angled, pale greenish 

 brown when they first appear, becoming bright red-brown during their first winter; often a 

 shrub. Winter-buds acute, |' long, with bright red or occasionally yellow scales, those of 

 the inner ranks pale brown tinged with pink, tomentose on the inner surface, becoming 

 1 ' long and narrow-spatulate. Bark of the trunk thin, smooth, and dark reddish brown. 

 Wood heavy, hard, close-grained, light brown or often nearly white, with thick lighter 

 colored sap wood. 



Distribution. Borders of mountain streams usually at elevations of 5000-6000; Rocky 

 Mountains from Montana to Wyoming, the Black Hills of South Dakota, Sioux County, 

 Nebraska, Colorado, Utah, Nevada, northern Arizona, and to the Sacramento Mountains, 

 New Mexico; in California from the Siskiyou Mountains along the Sierra Nevada to the 

 East Fork of the Kaweah River, Kern County, at altitudes of 5000-6000 at the north 

 and of 8000-9000 at the south. Passing into 



Acer glabrum var. Douglasii Dippel. 



Acer Douglasii Hook. 



Leaves ovate or oblong-ovate, slightly cordate by a wide shallow sinus, truncate or rarely 

 rounded at base, 3-lobed with acuminate lobes often slightly divided into acuminate lobules, 

 the terminal leaflet usually ovate from a broad base, or occasionally gradually narrowed 



Fig. 615 



below and rhombic in outline and sharply serrate to the base or nearly to the base of the 

 lobe with long-acuminate teeth pointing forward, dark green above, paler and often glau- 

 cescent below, 3|'-4' long and 3'-4' wide, with 3 prominent nerves extending to the points 

 of the lobes, and slender veins; petioles glabrous, I'-Stf in length. Flowers as in the species. 

 Fruit with erect or nearly erect wings, f '-!' long and %'-?' wide. 



