212 COMMON CANADIAN V/ILO PLANTS. 



13. S. balsamif era, Barratt. A small much-branched 

 shrub. Young twigs shining-chestnut on the sunny side. 

 Leaves ovate-lanceolate, usually slightly cordate at base, at 

 first very thin and of a reddish colour, at length rigid, dark- 

 green above, and paler and conspicuously reticulate-veined 

 beneath, slightly serrate, with slender petioles. Sterile 

 catkins very silky, -with a few bracts at the base; fertile 

 catkins leafy-peduncled, becoming very loose in fruit. 

 Capsules long-pedioelled. — Swamps, Atl. Prov. and north- 

 ward. 



14. S. myrtlUoi'deS, L. Low shrub, 1-3 feet high. Leaves 

 elliptic-obovate, an inch long, entire, smooth, somewhat 

 coriaceous when mature, revolute, reticulated, pale or glau- 

 cous beneath. Fertile catkins loosely few-flowered, on long 

 leafy peduncles. Capsules glabrous, on slender pedicels. — 

 Peat-bogs. 



8. POP'UMIS, Tourn. Poplar. 



1. P. tremuloi'des, Michx. (American Aspen.) A tree 

 with a, greenish-white bark, and roundish heart-shaped 

 leaves, continually in a state of agitation, due to the lateral 

 compression of the petiole, and the consequent susceptibility 

 of the leaf to the least motion of the air. Teeth of the leaves 

 small. 



2. P. grandidenta'ta, Michx., (Labge-toothed Aspen) 

 has roundish ovate leaves with large irregular sinuate teeth. 



3. f. balsamif era, L. (Balsam Poplar.) ^A tall tree, 

 growing in swamps and along streams ; the large buds var- 

 nished with resinous matter. Leaves ooaie, tapering, finely 

 serrate, whitish beneath. Stamens very numerous. 



Var.~ ean'dieans. Gray, (Balm op Gilead) has broader 

 and inore or less heart-shaped leaves. 



4. P. monilif era. Ait. (Cottonwood.) A tree with broad 

 deltoid leaves, slightly heart-shaped, serrate with incurved 

 teeth. Young branches slightly angled, at length round. 

 Fertile catkins very long, the scales cut-fringed, not hairy. 

 — Along the main line of the Grand Trunk Railway. 



