SAPINDACE. 
SILVA OF NORTH AMERICA. 89 
ACER MACROPHYLLUM. 
Broad Leaved Maple. 
FLowERs in long drooping racemes; ovary and young fruit hairy. Leaves deeply 
5-lobed. 
Acer macrophyllum, Pursh, F?. Am. Sept. i. 267. — Poiret, 
Lam. Dict. Suppl. v. 669. — Nuttall, Gen. i. 253; Sylva, 
il. 77, t. 67. —De Candolle, Prodr. i. 594. — Sprengel, 
Syst. ii. 225. — Hooker, Fl. Bor.-Am. i. 112, t. 38. — 
Don, Gen. Syst. i. 648.— Spach, Ann. Sci. Nat. ser. 2, 
ii. 165. — Torrey & Gray, Fl. N. Am. i. 246.— Hooker 
Rep. vi. 21, 69.— Cooper, Pacific R. R. Rep. xii. 28, 
57. — Lyall, Jour. Linn. Soc. vii. 134, 144. — Bolander, 
Proc. Cal. Acad. iii. 78. — Rothrock, Smithsonian Rep. 
1867, 334. — Koch, Dendr. i. 528.— Gray, Proc. Am. 
Acad. viii. 379. — Brewer & Watson, Bot. Cal. i. 107. — 
G. M. Dawson, Canadian Nat. n. ser. ix. 330. — Sargent, 
& Arnott, Bot. Voy. Beechey, 327. — Dietrich, Syn. ii. Forest Trees N. Am. 10th Census U.S. ix. 47. — Pax, 
1281.— Bentham, Pl. Hartweg. 301. — Torrey, Pacific Engler Bot. Jahrb. vii. 190. — Wesmael, Gen. Acer, 
hk. R. Rep. iv. 74; Bot. Mex. Bound. Surv. 47; Bot. 17. 
Wilkes Explor. Exped. 258.— Newberry, Pacific Rk. Rk. A. palmatum, Rafinesque, New Fl. i. 48 (not Thunberg). 
A tree, eighty to a hundred feet high, with a tall straight trunk two or three feet in diameter and 
stout often pendulous branches forming a compact handsome head. The bark of the trunk is from a 
half to three quarters of an inch thick ; it is brown faintly tinged with red or bright reddish brown, 
The branchlets are at 
first smooth and pale green; during the first winter they become bright green or dark red, and are 
deeply furrowed and broken on the surface into small square plate-like scales. 
covered more or less thickly with small longitudinal white spots, and encircled at the base with the 
scars of the accrescent inner bud-scales; during the second summer they turn gray or grayish brown. 
The obtuse terminal winter-buds are a quarter of an inch long, and are surrounded by two pairs of short 
broad slightly spreading dark red scales rounded on the back, ciliate on the margins, and contracted at 
the apex into short blunt points; the next pair of scales are also colored, with united edges, and are 
rounded at the apex. The remainder are green and foliaceous, and when fully grown are an inch and 
a half long, and are then colored, puberulous, and tipped with short blunt points. The axillary buds 
are minute, obtuse, and are not provided with the spreading outer scales of the terminal bud. The 
leaves are puberulous when they first unfold, especially on the upper surface along the principal veins ; 
they are prominently three to five-nerved, deeply three to five-cleft, with sinmuate acuminate divisions 
furnished with two or three acute lobes, and cordate at the base by a deep narrow sinus. They are 
rather coriaceous at maturity, dark green and lustrous on the upper, and pale on the lower surface, eight 
to twelve inches in diameter, and are borne on stout petioles ten or twelve inches long with enlarged 
bases which unite and encircle the stem and are often supplied on the inside with a small tuft of white 
hairs. In Oregon the leaves turn in the autumn to a bright orange-color before fallmg. The stami- 
nate and pistillate flowers are produced together in graceful pendulous slightly puberulous racemes four 
to six inches in length, which appear in April and May after the leaves are fully grown ; they are bright 
yellow, fragrant, a quarter of an inch long, and borne on slender pubescent and often branched pedicels 
a half to three quarters of an inch in length. The sepals are petaloid, obovate, obtuse, and a little 
longer and broader than the spatulate petals. There are nine or ten stamens with orange-colored an- 
thers and long slender filaments, hairy at the base, exserted in the sterile, and included in the fertile 
flower. The ovary is coated with pale tomentum, and in the staminate flower is reduced to a minute 
rudiment; the styles are united at the base only; and the stigmas are long and exserted. The fruit, 
which is fully grown by the first of July, is then pale green, and ripens late in the autumn; the nutlets 
