588 



SALICACEAE. 



VOL. I. 



2. Populus balsamifera L. Tacamahac. 

 Balsam or Carolina Poplar. Fig. 1441. 



Populus balsamifera L. Sp. PI. 1034. 1 753- 



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 somewhat 

 pubescent; stamens 18-30; lobes of the stigmas 

 broad; capsules ovoid, short-pedicelled. 



In moist or dry soil, especially along streams and 

 lakes, Newfoundland to Hudson Bay and Alaska, south 

 to Connecticut, New York, Michigan, South Dakota and 

 Oregon. Wood soft, weak, brown, compact ; weight per 

 cubic foot 23 Ibs. Ontario or rough-bark poplar. 

 April. 



3. Populus candicans Ait. Balm of 

 Giliad. Fig. 1442. 



P. candicans Ait. Hort. Kew. 3: 406. 1789. 

 P. balsamifera var. candicans A. Gray, Man. Ed. 2, 

 419. 1856. 



A large tree, sometimes nearly 100 high, with 

 a trunk up to 6i in diameter, the old bark 

 gray, ridged, the young twigs slightly pubescent, 

 the buds resinous, pointed. Leaves broadly ovate, 

 2i'-6' long, cordate to narrowed at the base, acute 

 at the apex, dark green above, pale beneath, crenu- 

 late, pubescent when young, and somewhat so on 

 the veins beneath when mature, the petioles terete, 

 pubescent or ciliate; aments 6' long or less, their 

 bracts lacerate; capsules narrowly ovoid, acute, 

 short-pedicelled, 3"~4" long. 



Roadsides and along streams, Newfoundland to Vir- 

 ginia, Michigan, South Dakota and Alaska ; in the 

 east mostly or wholly escaped from cultivation. 

 Wood soft, weak, brown ; weight per cubic foot about 

 24 Ibs. April-May. 



Populus angustifolia James. Narrow-leaved Cottonwood. Fig. 1443. 



Populus angustifolia James, Long's Exp. i: 497. 1823. 

 Populus balsamifera 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, drying 

 brownish, gradually acuminate or acute at the apex or 

 some of them obtuse, narrowed, rounded or rarely 

 subcordate at the base, 2'-4*' long, i'-ii' wide, finely 

 crenulate from base to apex; petioles plano-convex, 

 not flattened laterally; i'-i' long; lateral veins 8-15 on 

 each side of the blade; staminate aments oblong-cylin- 

 dric, I '-2$' long; lobes of the stigmas broad; capsules 

 ovoid, short-pedicelled. 



In moist soil, especially along streams, Assiniboia to 

 South Dakota, Nebraska, New Mexico, and Chihuahua. 

 Wood soft, weak, brown, compact; weight per cubic foot 

 24 Ibs. Black or willow-cottonwood. April-May. 



