SAPINDACEZ. 
SILVA OF NORTH AMERICA. 
111 
ACER NEGUNDO. 
Box Elder. 
FLOWERS diccious, destitute of petals. 
Acer Negundo, Linnzus, Spec. 1056. — Wangenheim, 
Nordam. Holz. 30, t. 12, £. 29. — Marshall, Arbust. Am. 
2.— Castiglioni, Viag. negli Stati Uniti, ii. 172. — La- 
marck, Dict. ii. 380. — Schmidt, Oestr. Baum. i. 14, t. 
12.— Walter, Fl. Car. 250.— Aiton, Hort. Kew. iii. 
436.— Michaux, Fl. Bor.-Am. ii. 253. — Persoon, Syn. i. 
418. — Desfontaines, Hist. Arb. i. 391. — Willdenow, 
Spec. iv. 992; Hnum. 1046. — Nouveau Duhamel, iv. 27, 
t. 7.— Trattinick, Archiv. i. t. 40. — Michaux f. Hist. 
Arb. Am. ii. 247, t. 18. — Pursh, Fl. Am. Sept. i. 268. — 
Hayne, Dendr. Fl. 216.— Elliott, Sk. i. 452. — James, 
Long’s Exped. ii. 69.— Torrey, Ann. Lyc. N. Y. ii. 
172; Emory’s Rep. 407. — Sprengel, Syst. ii. 225, — 
Guimpel, Otto & Hayne, Abdild. Holz. 119, t. 95. — Die- 
trich, Syn. ii. 1283. — Buchenau, Bot. Zeit. xix. 285, t. 
11, f. 31, 32. — Koch, Dendr. i. 544. — Baillon, Hist. Pl. 
v. 374, £. 426. — Pax, Engler Bot. Jahrb. vii. 211. 
Negundo aceroides, Moench, Meth. 334.— Torrey & Gray, 
Fl. N. Am. i. 250. — Nuttall, Sylva, ii. 91. — Gray, Gen. 
Il. ii. 202, t. 175; Jour. Bost. Soc. Nat. Hist. vi. 166 
(Pl. Lindheim. ii.) ; Pl. Fendler. 29 (Mem. Am. Acad. n. 
ser. iv.) ; Pl. Thurber. 300 (Mem. Am. Acad. n. ser. v.). — 
Darlington, 77. Cestr. ed. 3, 46. — Chapman, #7. 81. — 
Curtis, Rep. Geolog. Surv. N. Car. 1860, iii. 53. — Wat- 
Ash Leaved Maple. 
Leaves pinnately or ternately divided. 
son, King’s Rep. v. 52; Pl. Wheeler,7; Proc. Am. Acad. 
xvii. 338. — Rothrock, Wheeler's Rep. vi. 84. — Bell, 
Geolog. Rep. Canada, 1879-80, 48°.— Ridgway, Proc. 
U. S. Nat. Mus. 1882, 63. —Sargent, Forest Trees N. 
Am. 10th Census U. S. ix. 50. — Coulter, Rocky Mt. Bot. 
49. — Watson & Coulter, Gray’s Man. ed. 6, 118. 
Negundium fraxinifolium, Rafinesque, V. Y. Med. Rep. 
hex. 2, v. 352, 354; Desvaux, Jour. Bot. ii. 170. 
Negundo fraxinifolium, Nuttall, Gen. i. 253.— De Can- 
dolle, Prodr. i. 596.— Hooker, Fl. Bor.-Am. i. 114. — 
Don, Gen. Syst. i. 651.— Spach, Hist. Veg. iii. 119. — 
Rafinesque, New 7. i. 48.— Scheele, Roemer Texas, 
433. — Schnizlein, Icon. t. 227, £. 2, 18. 
? Negundo Mexicanum, De Candolle, Prodr. i. 596. — 
Schlechtendal, Linnea, xvi. 487.— Hemsley, Bot. Biol. 
Am. Cent. i. 214. — Pax, Engler Bot. Juhrb. vii. 212. 
Negundo trifoliatum, Rafinesque, New Fl. i. 48. 
Negundo lobatum, Rafinesque, New F7. i. 48. 
Negundo Californicum, Scheele, Roemer Texas, 433 (not 
Torrey & Gray). 
A. Negundo, var. Texanum, Pax, Engler Bot. Jahrb. 
vil. 212. 
Negundo Negundo, Sudworth, Garden and Forest, iv. 
166. 
A tree, fifty to seventy feet in height, with a trunk two to four feet in diameter, dividing near the 
ground into a number of stout wide-spreading branches. 
The bark of the trunk is from a quarter to 
half an inch thick, pale gray or light brown, and deeply cleft into broad rounded ridges, the surface 
separating into short thick scales. The branchlets when they first appear are pale green and glabrous 
or slightly pubescent; in their first winter they are marked with a few dark lenticels, and are bright 
1 
green and lustrous or sometimes pale purple with a glaucous bloom ;' in the second and third years they 
are gradually covered with smooth or somewhat fissured bark and are still marked with lenticels. The 
terminal winter-bud is acute, an eighth of an inch long, and rather longer than the obtuse lateral buds ; 
they are protected by scales with slightly overlapping edges and thickly coated with pale tomentum, the 
outer pair being often rudimentary, while the inner pairs are accrescent with the shoot, an inch long at 
maturity and deciduous, leaving when they fall conspicuous scars visible at the base of the branchlets 
for two or three years. The leaves are three or five-foliolate, and are borne on slender petioles two or 
three inches in length, with enlarged bases often furnished with a minute fringe of stipule-like decidu- 
ous white hairs, and in falling leave large conspicuous scars surrounding the stem ; the leaflets are ovate 
1 This purple color of the bark of the young branchlets seems which are hardier than those raised from seed gathered in the east. 
more common on the trees in the region between the Great Lakes This midcontinental form of the Negundo is found in German nur- 
and the eastern base of the Rocky Mountains than on those in other _ series under the name of Negundo Californicum, but it must not be 
parts of the country. Seed gathered in this region produce trees confounded with the Pacific-coast tree. 
which grow in cultivation more rapidly and to a larger size and 
