iqiq] SARGENT— north AMERICAN TREES 235 



The type station of this variety is Columbus, Muscogee County, Georgia. 

 It has also been collected in Georgia at Cuthbert, near Milledgeville, Mayfield, 

 and on Shell Bluff on the Savannah River below Augusta, at River Junction, 

 Florida, Calhoun Falls, South Carolina, in the streets of Raleigh, North Caro- 

 lina, at Campbell, southeastern Missouri, and on the San Luis IMountains in 

 southern New Mexico (.4. brachypterum) . This isolated New Mexican station 

 far to the westward of the region usually occupied by A.floridanmn is remark- 

 able, but in the shape of the leaves, in their pubescence and in that of the 

 petioles, pedicels, and branchlets, and in the length of the wings of the fruit, 

 it appears identical with some of the specimens of the var. filipes from the 

 southeastern states. 



Acer rubrum Linn. — A. carolinianum Walter, Fl. Car. 251. 

 1888. — A. stenocarpiim Britton in Britton and Shafer, N. Am. 

 Trees 64^, Jig. ^gS. 1908. — The leaves of the red maple are usually 

 green and glabrous or pubescent below early in the season, gener- 

 ally soon becoming glaucescent or glaucous below and glabrous or 

 they are usually rather longer than broad, generally cordate or 

 sometimes rounded at base, 3-5-lobed by acute sinuses with serrate 

 lobes and slender glabrous petioles; in the autumn they turn scarlet 

 on some trees and bright yellow on others. The flowers are red 

 or yellowish green (var. pallidijiorum Pax). The fruit on different 

 trees is red, yellow, or brownish. The branchlets and winter-buds 

 are glabrous. 



The red maple grows on the borders of streams, in wet swamps and in 

 upland forests, occasionally on dry hills, and is foimd from Newfoundland to 

 the banks of the Miami River in the extreme southern part of Florida, and 

 westward to western Wisconsin, jMinnesota, eastern Oklahoma, and to the 

 neighborhood of Houston, Harris County, Texas. 



A. stenocarpum Britton is based on a single small stunted tree growing on 

 a dry hill of flint rock at Allenton, St. Louis County, Missouri, on which the 

 samaras of the fruit vary in width up to 6 mm. This maple has been growing 

 in the Arboretum for several years. 



No other North American tree ranges through so many degrees of latitude 

 as separate Newfoundland from southern Florida. In the shape of the leaves 

 and in their pubescence, and in the size of the fruit, A. rubrum shows much 

 variation. The extremes of these varieties have sometimes been considered 

 species, but they are connected by so many intermediate forms that a better 

 idea of the red maple can perhaps be obtained by treating it as a species with 

 the following varieties: 



Acer rubrum var. tomentosum Pax, Engler Bot. Jahrb. 7: 182. 

 1886. — A. Drummondii Small, Fl. Southern U.S. 741 (insomuch as 



