CATALOGUE OF FORKST TREES. 171 



WILLOW. 



California, valley of the Klamatb river, southward through the western portions of the state, reaching in the 

 Sierra Nevadas an elevation of 3,500 to 4,000 feet above the sea. 



A small tree, sometimes 12 to 18 meters in height, with a trunk 0.45 to 0.50 meter in diameter, or northward 

 and at high elevations reduced to a low shrub ; leaves varying greatly in shape and breadth (vars. uitguntifolia 

 and latifolia, Andersson in De Candolle Prodr. xvi 2 , 255), or toward its southern limit often persistent until spring 

 (8. Hartweyi, Sent ham in PI. Harticeg, 52; S. humilis, var. JItirtiregi, Andersson, I. c. 2.'56). 



Wood light, soft, not strong, close-grained, compact; medullary rays numerous, thin ; color, light brown, the 

 sap-wood nearly white ; specific gravity, 0.5587 ; ash, 0.98 : somewhat used as fuel, especially in the southern part 

 of the state. 



317. Salix Sitchensis, s 



Bougurd in Mem. Acail. St. Petersburg, C ser. ii, 162. Ledebour, Fl. Rossica, iii, 609. Richardson, Arctic Exped. 43l>. Andersson in 

 Ofv. af. Vet. Akad. Forli. 1858, 126 (Proc. Am. Acad. iv, 6(5) : Kongl. Sven. Akad. Handl. vi, 106, f. 59 ; De Candolle, Prodr. xvi', 233. 

 Walpers, Ann. v,752. Gray in Proc. Am. Acad. vii, 402. Hall in Coulter's Dot. Gazette, ii, 93. Bebb in Bot. California, ii, 87; 

 Coulter's Bot. Gazette, vii, 25. 



8. cuneata, Kuttall, Sylva, i,66; 2 ed. i,82. 



SILKY WILLOW. 



Alaska, southward near the coast to Santa Barbara, California. 



A low, much-branched tree, rarely exceeding 8 meters in height, with a trunk 0.30 to 0.45 meter in diameter, 

 or more often a straggling shrub ; low, wet soil, borders of streams and ponds. 

 A form with narrow oblanceolate leaves is 



var. angUStifolia, Bebb in Hot. California, ii, 87. 



/S. chlorophylla, var. pellita, Andersson in Kongl. Sven. Akad. Handl. 139, f. 72; De Candolle, Prodr. xvi 2 , 244. 



Wood light, soft, close-grained, compact ; medullary rays numerous, thin ; color, light red, the sap-wood 

 nearly white ; specific gravity, 0.5072 ; ash, 0.59. 



318. Populus tremuloides, Michaux, 



Fl. Bor.-Am. ii, 243. Nouveau Duhamcl, ii, 184, t. 53. Persoou, Syu. ii, 623. Desfontaines, Hist. Arb. ii, 465. Micbaux f. Hist. 

 Arb.-Am. iii, 285, t. 8, f. 1 ; N. American Sylva, 3 ed. ii, 175, t. 99, f. 1. Poiret, Suppl. iv, 377. Willdenow, Enum. Snppl. 67. 

 Torrey.Ann. Lye. N. York, ii, 249; Compend. Fl. N. States, 375; Fremont's Rep. 97; Fl. N.York, ii, 214; Sitgreaves' Rep. 172; 

 Ives' Rep. 27; Bot. Wilkes Exped, 468. Beck, Bot. 323. Darlington, Fl. Cestrica, 3 ed. 281. Eaton, Manual, 117; 6 ed. 277? 

 Lindley, Fl. Med. 320. Hooker, Fl. Bor.-Am. ii, 154. Eaton & Wright, Bot. 370. Bigelow, Fl. Boston. 3 ed. 397. Spach in Ann. 

 Sci. Nat. 2 ser. xv, 30 ; Hist. Veg. x, 384. Nuttall, Sylva, i, 55 ; 2 ed. i, 70. Seringe, Fl. des Jard. ii, 56. Parry in Owen's Rep. 618. 

 Newberry in Pacilic R. R. Rep. vi,25, 89. Cooper in Smithsonian Rep. 1858, 257 ; Pacific R. R. Rep. xii 2 , 29, 68 ; Am. Nat. iii, 

 409. Hooker f. in Trans. Linnsean Soc. xxiil 9 , 301. Wood, Cl. Book, 655 ; Bot. & Fl. 311. Engelmann in Trans. Am. Phil. Soc. 

 new ser. xii, 209. Gray, Manual N. States, 5 cd. 46(5. Wesmrcl in De Candolle, Prodr. xvi 2 , 325. London Gard. Chronicle, 1871, 

 683. Watson in King's Rep. v, 327; PI. Wheeler, 17: Am. Jour. Sci. 3 ser. xv, 135; Bot. California, ii, 91. Porter in Hayden's 

 Rep. 1871,494. Porter & Coulter, Fl. Colorado; Hayden's Surv. Misc. Pub. No. 4, 128. Hayden in Warren's Rep. Nebraska & 

 Dakota, 2 ed. 121. Vasey, Cat. Forest Trees, 29. Hall in Coulter's Bot. Gazette, ii, 91. Macoun in Geological : Rep. Canada, 

 1875-76, 210. Rothrock in Wheeler's Rep. vi, 51. Beal in Am. Nat. xv, 32, f. 1. Trelease in Coulter's Bot. Gazette, vi, 284, f. 

 6. Sears in Bull. Essex Inst. xiii, 183. G. M. Dawsou in Canadian Nat. new ser. ix, 231. Ridgway in Proc. U. S. Nat. Mus. 1882, 87. 



P. trepida, Willdenow, Spec, iv, 803. Alton, Hort. Kew.2ed. 395. Pursh. Fl. Am. Sept. ii, CIS. Eaton, Manual, 117. 

 Nuttall, Genera, ii, 239. Sprengel, Syst. ii, 244. London, Arboretum, iii, 1649, f. 1510. 



P. tremuliformis, Emerson, Trees Massachusetts, 243; 2 ed. i.279 & t. 

 P. Atheniensis, Hort. Koch, Dendrologie, ii, 486 (excl. syn.). 



ASPEN. QUAKING ASP. 



Northern Newfoundland and Labrador to the southern shores of Hudson bay, northwest to the Great Bear 

 lake, the mouth of the Mackenzie river, and the valley of the Yukon river, Alaska; south in the Atlantic region to 

 the mountains of Pennsylvania, the valley of the lower Wabash river, and northern Kentucky ; in the Pacific 

 region south to the valley of the Sacramento river, California, and along the Eocky mountains and interior ranges 

 to southern New Mexico, Arizona, and central Nevada. 



A small tree, 15 to 18 meters in height, with a trunk rarely exceeding O.tiO meter iu diameter; very common 

 through British America and spreading over enormous areas bared by fire of the coniferous forest : in the Pacific 

 region very common upon moist mountain slopes and bottoms at an elevation of 6,000 to 10,000 feet ; the most 

 widelv-distributed. North American tree. 



