168 FOREST TREES OF NORTH AMERICA. 



310. Salix longifolia, Mulilenberg, 



Neue Schriften Gesell. Nat. Fr. Berlin, iv,238,t. 6, f. 6 (Ann. Bot. ii, 66, t. 5, f. 6). Willdcnow, Spec, iv, 670. Pereoou, Syu.ii, COO. 

 Pureh, Fl. Am. Sept. ii, 613. Nuttall, Genera, ii, 231. Torrey in Ann. Lye. N. York, ii, 248; Fl. N. York, ii, 209; Nicollet's Rep. 

 160; Fremont's Rep. 97; Emory's Rep. 412; Sitgreaves' Rep. 172; Bot. Mex. Boundary Survey, 204. Barratt, Sal. Am. No. 

 33. Beck, Bot. 320. Eaton, Manual, G ed. 319. Eaton & Wright, Bot. 408. Hooker, Fl. Bor.-Am. ii, 149. Dietricb, Syn. v, 

 420. Parry in Owen's Rep. 618.-=-Ricliard8on, Arctic Exped. 439,440. Cooper in Smithsonian Rep. 1858, 261. Andersson in Ofv. 

 af. Vet. Akad.Forh. 1858, 116 (Proc. Am. Acad, iv, 56); Kongl. Sven. Akad. Handl. vi, 54, f. 35; De CandoUe, Prodr. xvi, 214. 

 Walpers, Ann. v, 745. Lesqncreux in Owen's 2d Rep. Arkansas, 389. Wood, CI. Book, 65;(; Bot. & Fl. 310. Engelmuun in Proc. 

 Am. Phil. Soc. new ser. xii, 209. Gray, Manual N. States, 5 ed. 465. Watson in King's Rep. v, ,'524 ; Wlieelor's Rep. 1872, 493. 

 Gray in Proc. Am. Acad, vii, 402. Macoun in Geological Rep. Canada, 1875-76, 210. Vasey, Cat. Forest Trees, 29. Hall in 

 Coulter's Bot. Gazette, ii, 91. Bebb in Wheeler's Rep. vi, 240 ; Bot. California, ii, 84. Ward in Bull. U. S. Nat. Mus. No. 22, 116. 



S. fluviatalis, Nnttall, Sylva, i, 73; 2 ed. i,89. 



f 8. rubra, Richardson, Arctic Exped. Appx. 37! 



S. longifolia, var. pedicellata, Andersson in Kongl. Sven. Akad. Handl. vi, 55, f. 35 ; De CandoUe, Prodr. xvi^ 214. 

 Macoun in Geological Rep. Canada, 1875-76, 210. 



SAND-BAB WILLOW. 



Valley of the Connecticut river (Sunderland, Massachusetts, N. G. Jesup) and of the Potomac river at 

 Washington {Ward); west and northwest through the region of the great lakes to the valley of the Mackenzie 

 river, in latitude 6C N. {Richardson), through the Mississippi basin, Texas, the Rocky Mountain region, and the 

 Pacific Coast states. 



A small tree, 6 to 9 meters in height, with a trunk rarely exceeding 0.30 meter in diameter; borders of streams 

 and river sand-bars, in low, wet sandy soil, often forming low, dense clumps ; rare east of the Alleghany mountains; 

 very common throughout the Mississippi River basin, and reaching its greatest development in the valleys of 

 Oregon and northern California. 



Well-marked forms, varying from the type in the form of the leaves, aments, and nature of pubescens, etc., are 



var. exigua, Bebb in Bot. California, ii, 85. 

 , /8. ftrtgiMa, Nuttall, Sylva, i, 75; 2 ed. i, 90. 



8. longifolia, var. angustissima, Andersson in Ofv. af. Vet. Akad. Forh. 1858, 116 (Proc. Am. Acad, iv, 5G). 

 Western Texas to California and Oregon. 



var. argyrophylla, Andersson in Kongl. Sven. Akad. Handl. vi, 55; De CandoUe, Prodr. xvi=, 214. Watson in King's Rep. v, 

 324. Porter in Hayden's Rep. 1872, 493. Rothrock, PI. Wheeler, 50. Porter & Coulter, Fl. Colorado ; Hayden'a 

 Surv. Misc.Pnb.No. 4, 128. Macoun in Geological Rep. Canada, 1875-76, 210. Bebb in Bot. California, ii, 85. 



8. argophylla, Nnttall, Sylva, i, 71, t. 20 ; 2 ed. i, 87, t. 20. 



t 8. brachyearpa, Nnttall, Sylva, i, 69 ; 2 ed. i, 85. 



8. longifolia, var. opaca, Andersson in Kongl. Sven. Akad. Handl. vi,E5. 



8. longifolia, yar. argyropliylla angvstissima, AudeiBBOTi in Kongl. Sven. Akad. Handl. vi, 55; De CandoUe, Prodr. 

 xvi^, 214. 



8. longifolia, var. argyrophylla opaca, Anderssoo in De CandoUe, Prodr. xvi2, 214. 



Western Texas to Oregon. 



Wood light, soft, very close-grained, compact; medullary rays numerous, very obscure; color, brown tinged 

 with red, the sap-wood brown ; specific gravity, 0.4930 ; ash, 0.48. Var. exigua, heavier, the heart- and sap-wood 

 darker colored ; specific gravity, 0.5342 ; ash, 1.06. 



311. Salix sessilifolia, Nuttall, 



Sylva, i, 68; 2 ed. i, 84. Andersson in Ofv. af . Vet. Akad. Forh. 1858, 116 (Proc. Am. Acad. iv. 06) ; Kongl. Sven. Akad. Handl. vi,. :,:^, 

 f. 36; De CandoUe, Prodr. xvi^, 214. Walpers, Ann. v,746. Bebb in Bot. California, ii, 85. 



8. sessilifolia, var. Villosa, Andersson in De CandoUe, Prodr. xvi^, 215. 



Paget sound southward to northern California, near the coast. 



A small tree, 9 to 12 meters in height, with a trunk rarely exceeding 0.30 to 0.46 meter in diameter ; borders 

 of streams, in low, wet ground. 



