ACERACE^E 



701 



usually constricted at the base. Western Massachusetts through Ohio to northern Wis- 

 consin, Minnesota, Iowa and South Dakota, and to northern and southwestern Missouri; 

 in Nez Perces County, Idaho. 



Var. texamim Pax., with branchlets covered with pale tomentum. Leaves 3-foliate, 

 the leaflets ovate, or the terminal obovate, acuminate, short-pointed at apex, rounded or 

 cuneate at base, coarsely serrate above the middle or entire, only slightly and irregularly 

 lobed, early in the season villose along the midrib and veins above and thickly coated 

 below with matted pale hairs, and at maturity nearly glabrous on the upper surface and 

 covered below with loose pubescence, 3'-4' long and 2'-3' wide. Fruit puberulous, con- 

 stricted into a short stipe-like base. Western and southwestern Missouri, southeastern 

 Kansas, Arkansas, Oklahoma and eastern Texas to the valley of the San Antonio River. 

 Passing into forma latifolia Sarg. differing only in its glabrous branchlets, and distributed 

 from eastern Texas through Louisiana to western Mississippi, western North Carolina, 

 Virginia and southern Ohio. 



Var. interior Sarg., with branchlets covered with close pale pubescence, or rarely nearly 

 glabrous. Leaves trifoliate, with puberulous petioles, rachis and petiolules, the long- 

 stalked leaflets ovate to lanceolate, or the terminal sometimes obovate, acuminate and 

 long-pointed at apex, cuneate, rounded or cordate at base, coarsely serrate, sometimes 

 distinctly 3-Iobed at base, glabrous or villose on the midrib below, or in Arizona sometimes 

 sparingly pubescent on the lower surface, 3'-4' long and 1^-4' wide. Frujt glabrous, not 

 at all, slightly or at the north conspicuously constricted at the base. Southern Manitoba* 

 Saskatchewan and Alberta to Wyoming, and through the mountain regions of Colorado- 

 and Utah to New Mexico and Arizona. 



Var. arizonicum Sarg., with glabrous branchlets thickly covered with a glaucous bloom. 

 Leaves thin, 3-foliolulate; petioles slender, glabrous, If '-8' long, often turning bright red 

 late in summer; leaflets oblong-ovate to rhombic, acuminate and long-pointed at apex, 

 rounded or cuneate at base, coarsely serrate, often slightly lobed near the middle, glabrous 

 with the exception of conspicuous tufts of axillary hairs, 2j'-4' long, l|'-2' wide; petiolules 

 slender, glabrous, usually bright red, that of the terminal leaflet f'-l' long, the others not 

 more than |' in length. Fruit in glabrous racemes 3' or 4' long, the body glabrous, spread- 

 ing, not constricted at base. A tree, 20-25 high. Bark fissured. Mountain canons, cen- 

 tral and southern Arizona up to 8000 altitude, and in Socorro County, New Mexico. 

 More distinct is 



Acer Negundo var. calif ornicum Sarg. 



Leaves trifoliate with tomentose or nearly glabrous rachis and petiolules; leaflets ob- 

 long-ovate to rhombic, acuminate and long-pointed at apex, cuneate or unsymmetrically 



Fig. 632 



