SAPINDACES. SILVA OF NORTH AMERICA. do 
ACER BARBATUM. 
Sugar Maple. Rock Maple. 
FLowERrs in nearly sessile umbel-like corymbs, apetalous. Leaves 3 to 5-lobed. 
Acer barbatum, Michaux, F. Bor.-Am. ii. 252. — Willde- Hayne, Dendr. Fl. 214. — Elliott, Sk. i. 450. — De Can- 
now, Spec. iv. 989. — Poiret, Lam. Dict. Suppl. ii. 575. — dolle, Prodr. i. 595.— Torrey, Fl. N. Y. i. 135. — 
Pursh, F7. Am. Sept. i. 266. — Nuttall, Gen. i. 253. — Sprengel, Syst. ii. 225. — Hooker, Fl. Bor.-Am. i. 113. — 
Elliott, Sk. i. 451.— De Candolle, Prodr. i. 595. — Don, Gen. Syst. i. 650. — Spach, Hist. Veg. iii. 99; Ann. 
Sprengel, Syst. ii. 224. — Don, Gen. Syst. i. 649. — Spach, Sci. Nat. ser. 2, ii. 170. — Loudon, Arb. Brit. i. 411, 
Hist. Veg. iii. 118; Ann. Sci. Nat. ser. 2, ii. 178. — Tor- f. 122, t.— Torrey & Gray, Fl. N. Am. i. 248. — Die- 
rey & Gray, Fl. N. Am. i. 249, 684.— Hooker, Fl. Bor.- trich, Syn. ii. 1282. — Walpers, Rep. i. 409. — Nees, Pl. 
Am. i. 113 (in part). — Sargent, Garden and Forest, ii. Med. 5. — Emerson, Trees Muss. ed. 2, ii. 558, t. — Gray, 
364. Gen. Ill. ii. 200, t. 174. — Darlington, Fl. Cestr. ed. 3, 
A. saccharinum, Wangenheim, Nordam. Holz. 26, t. 11, f. 45. — Chapman, FV. 80. — Curtis, Rep. Geolog. Surv. N. 
26 (not Linnzus). — Lamarck, Dict. ii. 379. — Castiglioni, Car. 1860, iii. 51.— Bell, Geolog. Rep. Cunada, 1879- 
Viag. negli Stati Uniti, ii. 171. — Schmidt, Oestr. Baum. 80, 51°. — Ridgway, Proc. U. S. Nat. Aus. 1882, 62. — 
i. 12, t. 8. — Walter, Fl. Car. 251. — Aiton, Hort. Kew. Sargent, Forest Trees N. Am. 10th Census U.S. ix. 48. — 
iii. 434. — Ehrhart, Beitr. iv. 24. — Persoon, Syn. i. 417. — Pax, Engler Bot. Jahrb. vii. 241. — Watson & Coulter, 
Nouveau Duhamel, iv. 29, t. 8. — Willdenow, Spec. iv. Gray’s Man. ed. 6, 117. — Wesmael, Gen. Acer, 44. 
985; Enum. 1044. — Desfontaines, Hist. Arb. i. 392.— A. saccharophorum, Koch, Hort. Dendr. 80. 
Trattinick, Archiv. i. t. 3. — Michaux f. Hist. Arb. Am. A. Saccharum, Britton, Cat. Pl. N. J. 78 (not Mar- 
ii. 218, t. 15. — Bigelow, Fl. Boston. 247. — Pursh, £7. shall). — Hitchcock, Trans. St. Louis Acad. v. 490. 
Am. Sept. i. 266. — Nuttall, Gen. i. 253; Sylva, ii. 88. — 
A noble tree, a hundred or a hundred and twenty feet high, with a trunk three or four feet in 
diameter, rising sometimes in the forest to the height of sixty or seventy feet without a branch, or 
in open situations developing, eight or ten feet from the ground, stout upright branches which form, 
while the tree is young, a narrow egg-shaped head, and begin to spread when it is fifty or sixty years 
old, gradually making a broad round-topped dome often seventy or eighty feet across. The bark of 
large trunks is from a half to three quarters of an inch thick, and is broken into deep longitudinal fur- 
rows, the light gray-brown surface separating into small scales. The bark of the young trunks and of 
the principal branches is pale and smooth or slightly fissured. The branchlets are green when they 
appear, but by the end of the first season become orange-brown ; they are then lustrous and marked 
with numerous large pale oblong lenticels, and are encircled at the base with the scars left by the falling 
of the accrescent inner bud-scales; in the second winter they are pale brown tinged with red, and are 
still faintly marked with lenticels. The winter-buds are acute, a quarter of an inch in length, and 
covered with about sixteen purple slightly puberulous pointed scales imbricated in pairs, those of the 
outer pairs being much reduced in size. The inner scales lengthen with the growing shoot until at 
maturity they are an inch and a half long, narrowly obovate, contracted at the apex into a short blunt 
point, thin, coated with pubescence, and bright canary-yellow. The leaves are three to five-lobed with 
rounded sinuses and usually acute sparingly sinuate-toothed lobes, and with three to five conspicuous 
pale primary veins and reticulated veinlets; they are heart-shaped by a broad or narrow sinus, or trun- 
cate or sometimes wedge-shaped at the base, densely coated when they unfold with pale tomentum, 
glabrous or more or less pubescent on the under surface at maturity, four or five inches across, often 
rather coriaceous, dark green and opaque on the upper, and generally paler on the lower surface. They 
