V 



174 FOREST TREES OF NORTH AMERICA. 



322. Populus angustifolia, James, 



LoDg'8 Exped. i, 497. Torrey in Ann. Lye. N. York, ii, 249; Fremont's Rep. 1/7; Sitgreaves' Bep. 172; Ives' Eep.i"?; Bot. nrilke 

 Exped. 469. Niittall, Sylva, i, 52, t. 16 ; 2 ed. i, 68, 1. 16. Cooper in Smithsonian Rop. 1858, 261 ; Am. Nat. iii, 408. Hajden in 

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

 California, ii, 91. 



P. Canadensis, var. angustifolia, Wtsmtel in De CandoUe, Prodr. xvi^, 329. 



P. bahami/era, var. angustifolia, Watson in King's Rep. v, 327 ; PI. Wheeler, 17. I'orter in Hayden's Rop. 1871, 494. 

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

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



BLACK COTTONWOOD. 



Black hills of Dakota (B. Douglas), Swimming Horse creek, and the Snowy Mountain region, Montana, Red 

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

 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 G,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, 767. Cooper in Smithsouiau Rep. 1858, 266. Wesmael in De Candolle, Prodr. xvi', 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, 1875-'76, 211. Trelease in Coulter's Bot. Gazette, vi, 285, f. 5. G. M. Dawson in Canadian Nat. new 

 ser. ix, 331. 



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



P. angustifolia, Newberry in Pacific B. B. Rep. vi, 89 [not James]. Cooper in Pacific E. R. Rep. xii', 29, 68. 



P. halsamiferq:, Lyall in Jour. Linuiean Soc. vii, 134 [not Linnseus]. 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. halsamifera, var. ? 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 Root mountains, Montana ( Watson), 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 lands below 6,000 feet elevation ; very common and reaching its greatest development in the valleys of th 

 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.Kew.iil, 406; 2 ed. v, 396. Abbot, Insects Georgia, ii, 71.-Nouveau Dnhamel, ii, 186. Willdenow, Spec, iv, 805^ Euum. 1017-, 

 Berl. Baumz.292. PersooD, SJ-n. ii,623. Desfontaines, Hist.Arb.il, 46.5. Michanx f. Hist. Arb. Am. iii,2y5, t. 10,f.2; N.American 

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

 F1.202. .Spreugel, Syst. ii, 244. Watson, Dend. Brit. ii,t. 10-.i. Bock, Bot. 323. Eaton, Manual, G od. 278. Loudon, 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 Fromout's Rep. 

 97; Fl.N. York, ii, 215; Pacific R. R. Rep. v, 365. Emerson, Trees Mas.sachusott8,249; 2 ed. i,287. Seringo in F). dos Jard. ii,63. 

 Cooper in Smithsonian Rep. 1858, 257. Gr.ay in Pacific K. R. Rop. xii-!, 47 ; Manual N. States, 5 ed. 467. Curtis in Rep. Geological 

 Surv. N. Carolina, 1860, iii, 72. Lesqneronx in Owen's 2d Rop. Arkansas, 389. Wood, CI. Book, 655. Engelmauu in Trans. Am. 

 Phil. Soc. xii, 2C9. Watson in King's Rep. v, 327 ; Am. Jour. Sci. 3 ser. xv, 136. Hayden in Warren's Rep. Nebraska & Dakota, 2 ed. 

 121. Macoun in Geological Rep. Canada, 1875-'76, 211. Trelease in Coulter's Bot. Gazette, vi, 285, f. 3, 4. Ward in Bull. U. S. Nat. 

 Mus. No. 22, 116. Beal in Am. Nat. xv, 34, f. 3. Bell in Geological Kep. Canada, 1879-'80, 56'". Ridgway in Proc. U. S. Nat. Mus, 

 1882, 87. Chapman, Fl. S. States, Suppl. 649. 



f P. deltoide, Marshall, Arbnstum, 106. 



