WILLOW FAMILY. 491 
2. Populus balsamifera L. ‘T'acamahac. 
Balsam Poplar. (Fig. 1165.) 
Populus balsamifera 1. Sp. Pl. 1034. 1753- 
A large tree, with nearly smooth gray bark, reach- 
ing a maximum height of about 80° and a trunk 
diameter of 7°, the branches stout, spreading, the 
large buds very resinous, the foliage glabrous. 
Leaves broadly ovate, dark green and shining 
above, pale beneath, acute or acuminate at the 
apex, rounded or subcordate at the base, crenulate, 
3/-5’ long, petioles terete; aments and bracts some- 
what pubescent; stamens 15—30; lobes of the stigmas 
broad; capsule ovoid, 2-valved, short-pedicelled. 
In moist or dry soil, especially along streams and 
lakes, Newfoundland to Hudson Bay and Alaska, south 
to Maine, New York, Michigan, Idaho and British 
Columbia. Wood soft, weak, brown, compact; weight 
per cubic foot 23 lbs. April. 
Populus balsamifera candicans (Ait.) A. Gray, Man. 
Ed. 2, 419. 1856. BALM OF GILEAD. 
Populus candicans Ait. Hort. Kew. 3: 406. 1789. 
Leaves broader, cordate at the base; petioles usually pubescent. New Brunswick to New Jer- 
sey, west to Minnesota, mostly escaped from cultivation, apparently indigenous northward. 
3. Populus angustifolia James. Narrow-leaved Cottonwood. (Fig. 1166.) 
Populus angustifolia James, Long’s Exp. I: 497. 1823. 
Populus baisamifera var. angustifolia S. Wats. Bot. 
King’s Exp. 327. 1871. 
A slender tree, maximum height about 65°, trunk 
diameter 2°; crown narrowly pyramidal, branches as- 
cending, foliage glabrous. Twigs terete, gray; leaves 
lanceolate, ovate-lanceolate or ovate, spreading, dry- 
ing brownish, gradually acuminate or acute at the 
apex or some of them obtuse, narrowed, rounded sr 
rarely subcordate at the base, 2’-414’ long, %/-14/ 
wide, finely crenulate from base to apex; petioles 
plano-convex, not flattened laterally; 4%/’—%’ long; 
lateral veins 8-15 on each side of the blade; stami- 
nate aments oblong-cylindric, 1/-214’ long; lobes of 
the stigmas broad; capsules ovoid, short-pedicelled. 
In moist soil, especially along streams, Northwest Ter- 
ritory to Dakota, Nebraska, New Mexico, and Arizona. 
Wood soft, weak, brown, compact; weight per cubic foot 
24 lbs. April-May. 
4. Populus acuminata Rydberg. Black 
Cottonwood. (Fig. 1167.) 
Poprius acuminata Rydberg, Bull: Torr. Club, 20: 50. 
1893. 
A slender tree, with terete twigs, reaching ap- 
proximately the dimensions of the preceding spe- 
cies, the crown broadly pyramidal with spreading 
branches, the foliage glabrous. Leaves rhomboid- 
lanceolate, spreading or drooping, drying green, 
abruptly or gradually long-acuminate at the apex, 
cuneate, obtuse or rounded at the base, 2’-6’ long, 
1/-24’ wide, crenulate or the base entire; petioles 
slender, 1/-214’ long; staminate aments about 112’ 
long; pistillate aments slender, drooping, 3/-5/ 
long; capsules oyoid, obtuse, distinctly pedicelled. 
Range apparently nearly that of the preceding 
species. April-May. ~ 
