GENUS 2. 



WILLOW FAMILY. 



599 



20. Salix petiolaris J. E. Smith. Slender 

 Willow. Fig. 1470. 



S. petiolaris J. E. Smith, Trans. Linn. Soc. 6 : 122. 1802. 

 5. gracilis Anders. Proc. Am. Acad. 4: 67. 1858, 



A shrub, similar to the preceding species, but 

 the young leaves only slightly silky, the branches 

 slender, upright or ascending. Mature leaves lanceo- 

 late, acuminate at both ends, serrulate with blunt 

 cartilaginous teeth, remaining green in drying, 4"- 

 8" wide; petioles 2"-s" long; stipules deciduous; 

 aments expanding before the leaves, the pistillate 

 short-peduncled, usually rather loose, about i' long 

 in fruit; bracts villous, oblong to obovate; stamens 

 2; filaments glabrous; stigmas nearly sessile; cap- 

 sule tapering from an ovoid or oblong base, pubes- 

 cent, 2i"-4' long, usually about twice as long as 

 the filiform pedicel. 



Swamps, New Brunswick to Manitoba, Tennessee, 

 Michigan and North Dakota. Dark long-leaved willow. 

 May. 



21. Salix Bebbiana Sarg. Beaked, Livid 

 or Bebb's Willow. Fig. 1471. 



Salix rostrata Richards. Frank. Journ. App. 753. 



1823. Not Thuill. 1799. 

 Salix Bebbiana Sarg. Card. & For. 8: 463. 1895. 



A shrub, 6-i8 tall, or sometimes a tree 25 

 high, the twigs pubescent or puberulent, terete. 

 Leaves elliptic, oblong or oblong-lanceolate, 

 acute, acuminate or some of them blunt at the 

 apex, rounded or narrowed at the base, spar- 

 ingly serrate or entire, dull green and puberu- 

 lent above, pale, reticulate-veined and tomen- 

 tose beneath or nearly glabrous on both sides 

 when very old; petioles 2"-6" long; stipules 

 semicordate, acute, deciduous ; aments sessile, 

 expanding with or before the leaves, dense, 

 the staminate i'-ii' long, the pistillate 2' long 

 in fruit; bracts villous; stamens 2; filaments 

 distinct, glabrous; stigmas nearly sessile; cap- 

 sule very narrowly long-conic, densely pubes- 

 cent, twice as long as the filiform pedicel. 

 Dry soil and along streams, Newfoundland to Alaska, New Jersey, Nebraska and Utah. April-May. 

 Salix perrostrata Rydb., inhabiting hillsides and stream-banks from Nebraska and South Da- 

 kota to New Mexico and Yukon Territory, differs in having leaves thinner, glabrous when mature. 



22. Salix discolor Muhl. Pussy, Glaucous or 

 Silver Willow. Fig. 1472. 



Salix discolor Muhl. Neue Schrift. Ges. Nat. Fr. Berlin 



4: 234. pi. 6. f. i. 1803. 



Salix eriocephala Michx. Fl. Bor. Am. 2: 225. 1803. 

 Salix prinoides Pursh, Fl. Am. Sept. 613. 1814. 

 Salix laurentiana Fernald, Rhodora 9: 221. 1907. 



A shrub or low tree, maximum height 25, trunk 

 diameter i; twigs glabrous or pubescent; young 

 leaves sometimes pubescent. Mature leaves usually 

 glabrous, bright green above, glaucous and nearly 

 white beneath, oblong, oblong-lanceolate or oblanceo- 

 late, acute at both ends, irregularly serrate or nearly 

 entire, slender-petioled, 3' -5' long, 8"-i8" wide ; 

 petioles 3"-i2" long; stipules obliquely lanceolate or 

 semicordate, commonly deciduous ; aments unfolding 

 much before the leaves, dense, the pistillate ii'~3' 

 long in fruit ; bracts persistent, brown-purple, vil- 

 lous ; stamens 2 ; filaments glabrous ; stigmas nearly 

 sessile; capsule narrowly conic, tomentose, 2$"-3 ' 

 long, much longer than its pedicel. 



In swamps or on moist hillsides. Nova Scotia to 

 Saskatchewan, Delaware and Missouri. Consists of several races differing in pubescence and 

 in leaf-forms. Wood soft, weak, yellow-brown ; weight per cubic foot 27 Ibs. Bog- or swamp- 

 willow. March-May. 



