174 FOREST TREES OF NORTH AMERICA. 







322. Populus angust.ifolia, James, 



Long's Exped. i, 497. Torrey in Ann. Lye. N. York, ii. 249; Fremont's Rep. 97; Sitgreaves' Rep. 172; Ives' Rep. 27; Bot. Wilkea 

 Exped. 469. Nuttal), Sylva, i, 52, t. 16: 2 ed. i, 68, t. 16. Cooper in Smithsonian Rep. 1858, 261; Am. Nat. iii,408. Hayden in 

 Warren's Rep. Nebraska & Dakota, 2 ed. 121. Vasey, Cat. Forest Trees, 29. Watson in Am. Jonr. Sci. 3 ser. xv, 136; Bot. 

 California, ii, 91. 



P. Canadoisis, var. angitstijolia, Wesnuel in De Candolle, Prodr. xvi-,329. 



P. balsamiferd, var. '(niyimtifolia, Watson in King's Rep. v, 327 ; PI. Wheeler, 17. Porter in Haydeu's Rep. 1871, 494. 

 Porter A- Coulter, Fl. Colorado; Haydeu's Surv. Misc. Pub. No. 4, 128. Macoun in Geological Rep. Canada, 1875-'76, 

 211. Rusby in Bull. Torrey Bot. Club, ix, 106. 



% BLACK COTTONWOOD. 



Black hills of Dakota (R. Dour/las), Swimming Horse creek, and the Snowy Mountain region, Montana, Eed 

 Rock creek, southwestern Montana (Watson), east Humboldt and Shoshone mountains, Nevada, Eocky mountains 

 of Colorado, and the ranges of southwestern New Mexico and eastern Arizona. 



A small tree, 15 to 18 meters in height, with a trunk rarely exceeding 0.60 meter in diameter; borders of streams,. 

 between 6,000 and 10,000 feet elevation. 



Wood light, soft, weak, close-grained, compact ; medullary rays numerous, obscure ; color, brown, the sap-wood 

 nearly white ; specific gravity, 0.3912 ; ash, 0.79 



323. Populus trichocarpa, Torrey & Gray; 



Hooker, Icon.v, 878. Walpers, Ann. v, 707. Cooper in Smithsonian Rep. 1858, 206. Wesmsel in De Candolle, Prodr. xvi 2 , 330. 

 Watson in King's Rep. v, 328; Am. Jour. Sci. 3 ser. xv, 136; Bot. California, ii, 91. Torrey, Bot. Wilkes Exped. 469. Macoun 

 in Geological Rep. Canada, 187. r >-'76, 211. Trelease in Coulter's Bot. Gazette, vi, 285,. f. 5. G. M. Dawson in Canadian Nat. new 

 ser. ix, 331. 



P. bahamifera, var. Hooker, Fl. Bor.-Am. ii, 154. 



P. angustifolia, Nowberry in Pacific R. R. Rep. vi, 89 [not James]. Cooper in Pacific R. R. Rep. xii 2 , 29, 68. 



P. balsamifera, Lyall in Jour. Linmean Soc. vii, 134 [not Linnaeus]. Hall in Coulter's Bot. Gazette, ii, 91. 



P. trichocarpa, var. cupulata, Watson in Am. Jour. Sci. 3 ser. xv, 136 ; Bot. California, ii, 91. 



P. balsamifera, var. I Californica, Watson in Am. Jour. Sci. 3 ser. xv, 136. 



BLACK COTTONWOOD. BALSAM COTTONWOOD. 



Valley of the Fraser river, British Columbia, and probably much farther north, east to the eastern base of the 

 Bitter Boot mountains, Montana ( Watsan), south through Washington territory, western Oregon and California to 

 the southern borders of the state. 



A large tree, 24 to 60 meters in height, with a trunk 1.20 to 2.10 meters in diameter ; banks of streams and 

 bottom lauds below 6,000 feet elevation ; very common and reaching its greatest development in the valleys of the 

 lower Columbia river and the streams flowing into Puget sound, here the largest deciduous tree of the forest. 



Wood very light, soft, not strong, rather close-grained, compact; medullary rays thin, hardly distinguishable; 

 color, light dull brown, the sap-wood lighter, nearly white ; specific gravity, 0.3814 ; ash, 1.27 ; in Oregon and 

 Washington territory largely manufactured into staves of sugar barrels, woodenware, etc. 



324. Populus monilifera, Alton, 



Hort. Ke\v. iii, 406 ; 2 ed. v, 390. Abbot, Insects Georgia, ii, 71. Nouveau Duhamel, ii, 186. Willdenow, Spec, iv, 805 ; Euum. 1017 ; 

 Berl. Baumz. 292. Persoon, Syn. ii, 623. Desfontaines, Hist. Arb. ii, 465. Michaux f. Hist. Arb. Am. iii, 295, 1. 10, f. 2 ; N. American 

 Sylva, 3 ed. ii, 168, t. 96, f. 2. Pursh, Fl. Am. Sept. ii, 618. Nuttall, Genera, ii, 239 ; Trans. Am. Phil. Soc. 2 ser. v, 167. Hayne, Dend. 

 F1.202. Sprengel, Syst. ii, 244. Watson, Dend. Brit. ii,t. 102. Beck, Bot. 323. Eaton, Manual, 6 ed. 278. London, Arboretum, 

 iii, 1657, f. 1517 & t. Eaton & Wright, Bot. 371. Spach in Ann. Sci. Nat. 2 ser. xv, 32 ; Hist. Veg. x, 389. Torrey in Fremont's Rep. 

 97 ; Fl. N. York, ii, 215 ; Pacific R. R. Rep. v, 365. Emerson, Trees Massachusetts, 249 ; 2 ed. i, 287. Seringe in Fl. des Jard. ii, 63. 

 Cooper in Smithsonian Rep. 1858, 257. Gray in Pacific R. R. Rep. xii 2 , 47; Manual N. States, 5 ed. 467. Curtis in Rep. Geological 

 Surv. N. Carolina, 18(iO, iii, 72. Lesquereux in Owen's 2d Rep. Arkansas, 389. Wood, Cl. Book, 655. Engelmann in Trans. Am. 

 Phil. See. xii, 209. Watson in King's Rep. v, 327; Am. Jour. Sci. 3 ser. xv, 136. Hayden in Warren's Rep. Nebraska & Dakota,-' IM|. 

 121. Maconn in Geological Rep. Canada, l-7:>-'70, 211. Trelease in Coulter's Bot. Gazette, vi, 285, f. 3, 4. Ward in Bull. U. S. Nat . 

 Mns.No.22, llli. Beal in Am. Nat. xv, 34, f. 3. Bell in Geological Rep. Canada, 1879-'80, 56 C . Ridgway in Proc. U. S. Nat. Mils. 

 1882, 87. Chapman, Fl. S. States, Suppl. 049. 



f P. deltoidf, Marshall, Ai-bustum, 100. 



