Ill' FiKi.D Manual 



7. Ix'Hves creiiulate-deiitate. glabrous cxct-pt the ciliate niar- 

 uins. r. frcnvuloicies. 



1. Populus alba L. White Poplar. A large tree with 

 smooth, light, greenish-gra}- bark often with black diamond- 

 shaped scars ; sprouting freely from the roots and hence not 

 desirable for yards. Young foliage densely white-tomentose, 

 the leaves becoming glabrate and dark green above, broadly 

 ovate or nearly orbicular in outline. 3-5 lobed, or irregularly 

 dentate, 2-4 in. long. Wood soft and nearly white. Native 

 of Europe and Asia. N. B. to Ont., Va., and Ohio. 



2. Populus heterophylla L. Swamp Poplar. An ir- 

 regularly brandling tree with rough bark. Leaves long- 

 petioled, broadly ovate, crenulate-denticulate, 5-6 in. long. 

 Wood soft, compact, weak, brown in color. In swamps. Conn, 

 to Ga.. west to La. and northward to Mo.. Lid. and Ohio. 



3. Populus balsamifera L. Balsam Poplar. A large 

 tree with nearly smooth gray bark. Leaves broadly ovate, 

 dark green and shining abcve, pale beneath, rounded or 

 acute at the base, crenulate, 3-5 in. long. Wood very light 

 and soft, weak, brown. Li moist or dry soil, commonly 

 along- streams and lakes. The subspecies P. balsamifera 

 candicans (Ait.) Gr. Balm-of-Gilead, has the leaves 

 broadly ovate, truncate or cordate at the base, and the petioles 

 and nerves usually puberulent. Mostly escaped from culti- 

 vation. Xewf. to Alaska, soutli to Va., Ohio, S. Dak., and Ore. 

 — — 4. Populus deltoides Afarsh. Cottonwood. A large 

 tree of very rapid growth, witli rough, deeply furrowed, brown 

 bark when old. Bark of } oung trees grayish-green and rather 

 smooth. The giant of the poplars. -Petiole much flattened 

 laterally causing the leaves to rustle in the wind. Leaves 

 glabrous, broadly deltoid-ovate, abruptly acuminate at the 

 apex, crenulate, truncate at the base, 4-7 in. long. Wood light 

 and soft and very durable if kept in the dry; used for building 

 lumber, light boxes, paper pulp, sugar and flour barrels, 

 cracker boxes, crates and wooden warfe ; also a good fuel 

 wood. A most useful and crnamerital tree of very rapid 

 growth if planted in ravines and low places. In cities only 

 staminate trees should be planted. In favorable soil often at- 

 taining a trunk diameter of 3j ft. in 40 years. In moist soil. 



