iQig] SARGENT— NORTH AMERICAN TREES 241 



Acer Negundo var. californicum Sargent, Garden and 

 Forest, 4:148. 1891; Silva N. Am. 2:112. /?/. p/. 1891. — Negundo 

 californicum Torrey and Gray, Fl. N. Am. 1:250, 684. 1838; 

 Rydberg, Bull. Torr. Bot. Club 40:56. 1913. — Acer californicum 

 Dietrich, Syn. 2:1283. 1840; Pax, Engler Bot. Jahrb. 7:213 (in 

 part). 1836; 11:75. 1890. — Negundo aceroides Torrey, Pacific 

 R.R. Rep. 4:74 (not Moench). 1857. — Negundo aceroides var. 

 californicum Sargent, Garden and Forest 2:364. 1889. — Acer 

 Negundo subsp. californicum Wesmael, Bull. Soc. Bot. Belg. 29:43. 

 1890. — Rulac californica Nieuwland, Am. Mid. Nat. 2: 139 (in part). 

 191 1. — Leaves trifoliate with tomentose or nearly glabrous petioles, 

 rachis, and petiolules; leaflets oblong-ovate to rhombic, acuminate 

 and long-pointed at apex, cuneate or unsjTnmetrically rounded at 

 base, coarsely serrate above the middle or nearly entire, occasionally 

 deeply lobed, glabrous on the upper surface except along the midribs 

 and veins, thickly coated on the lower surface with matted pale 

 hairs and furnished with large axillary tufts. Fruit on pubescent 

 pedicels, puberulous or nearly glabrous, not constricted or rarely 

 slightly constricted at base. 



A large tree with dark bark, hoary tomentose branchlets. and winter-buds. 



Valley of the lower Sacramento River southward to San Bernardino 

 County, California. The California box elder was discovered by David 

 Douglas in 1833, probably in the neighborhood of Monterey. 



Fraxinus AMERICANA var. subcoriacea, n. var. — Differing from 

 the t^pe in its thicker, entire or shghtly serrate leaflets, silvery white 

 on the lower surface. Individual trees of F. americana occur with 

 thick, oblong-ovate, acuminate, entire or slightly serrate leaflets 

 dark green and lustrous above, silvery white below, glabrous or 

 slightly villose along the midribs, and 7.5-13 cm. long. These 

 trees are so distinct in appearance and in their more rapid and 

 vigorous growth that it seems desirable to give them a varietal des- 

 ignation. What may be considered the t^-pe of the variety has been 

 growing in the Arnold Arboretum since 1874, where it was raised 

 from seed sent by W. C. Hampton from Mount Victory, Harding 

 County, Ohio, as '^Fraxinus C." The trees of this variety have 

 grown more rapidly and are handsomer than any of the other 

 American ashes in the collection. In 1910 and 191 2 I collected the 



