SALICACEAE (WILLOW FAMILY) 133 



ianceolate to ovate-lanceolate, acute to short-acuminate at the apex, rounded 

 to cordate at the base, 4-8 or 10 cm. long, 1.5-4 cm. wide, entire to serrulate, 

 mostly yellowish-green, glaucous beneath; stipules ovate to lunate, entire to 

 sei'rulate: aments nearly sessile, on very short-bracted peduncles; staminate 

 2-3 cm. long; pistillate 2-4 cm. long, 1 cm. wide; scales oblanceolate, acute to 

 obtuse, tawny, thinly pilose: capsules ovate-conic, 4 mm. long; pedicels 

 0.7-2 mm. long; styles less than 0.5 mm. long. — Common plants of stream 

 banks and wet places; Colorado to California, northward to Canada. Dis- 

 tinguished only with difficulty from S. cordata and may perhaps prove to be 

 only a variety of that species. 



13. Salix Mackenziana Barr. Hook. Fl. Bor. Am. 2: 149. 1839. Shrub 

 2-4 m. high; twigs usually divaricate, lustrous: leaves oblanceolate or nar- 

 rowly obovate, sometimes lanceolate, mostly acuminate at the apex, cuneate 

 to rounded at the base, 3-6 or 7 cm. long, 1-1.8 cm. wide, entire or serrulate, 

 light green above, glaucous beneath, reticulate on both sides; stipules lunate, 

 entire to serrate-dentate: aments coetaneous, on leafy peduncles 0.5-1 cm. 

 long; pistillate aments 2-6 cm. long, 1.5 cm. wide, rather lax in fruit; stami- 

 nate aments 2-4.5 cm. long; filaments free, or imited only at the base; scales 

 mostly oblanceolate, tawny or fuscous, thinly pilose: capsules ovate-conic, 

 4-5 mm. long, greenish; pedicels 3-4 mm. long, about three times as long as 

 the scales; styles 0.3-0.4 mm. long; stigmas entire or sometimes emarginate. 

 Very closely related to S. cordata and S.lutea. — ^Fairly common along streams 

 and in wet places; northwestern Wyoming to Saskatchewan, west to Nevada 

 and California. 



14. Salix pyrifolia Anders. Vet. Acad. Handl. Stockh. 6: 162. 1867. Shrub 

 1-3 m. high; twigs slender, glabrous, bright chestnut to brown, lustrous: 

 leaves ovate-lanceolate, ovate, or obovate-oval, abruptly caspidate to short- 

 acuminate at the apex, rounded or cordate at the base, 3.5-7 cm. long, 1.5-3.5 

 cm. wide, shallowly glandular-serrulate, thih, translucent, pure dark green 

 and reticulate with slender veins on both sides; stipules lunate or broadly 

 ovate, glandular-serrate to dentate: peduncles short, leafy; aments coetaneous, 

 long, lax; the staminate slender, flexiious, 4-6 cm. long, 8-10 mm. wide; 

 filaments united for one third to three fourths their length; pistillate aments 

 3-6 cm. long, 1.2-1.8 mm. wide: capsules 3-4.5 mm. long; pedicels 2.5-4 mm. 

 long, about three times as long as the scales; styles 0.3-0.7 mm. long; stigmas 

 usually deeply divided. (S. rotundifolia ovata Nutt.) — ^Fairly common, 

 mountains of Idaho, Oregon, Washington, and British Columbia. 



14a. Salix pyrifolia obscura Anders. I.e. Leaves obovate-oval to subrotund, 

 abruptly cuspidate to rounded at the apex: pedicels 2-3 cm. long: stipules 

 more ovate. (S. rotundifolia Nutt. 1. c. 75.) Presenting a transition to S. 

 pseudomyrsinites. — -Vicinity of Yell9wstone Park and northward. 



15. Salix pseudomyrsinites Anders. Oefvers. Vet. Akad. Foerhandl. 15: 129. 

 1858. Shrub 1-3 m. high; twigs slender, mostly short, divaricate, leafy, 

 bright chestnut to dark brown, lustrous: leaves elliptic-oblanceolate to 

 lanceolate-oblong, acute to acuminate at the apex, mostly rounded at the 

 base, 3-6 cm. long, 1-2 cm. wide, shallowly glandular-serrulate or subentire, 

 dark green above, pure green, scarcely paler and coarsely reticulate with 

 broad veins beneath; petioles 3-8 mm. long, glabrous or thinly villous; stip- 

 ules lanceolate to ovate, acute or acuminate, glandular-serrate, 4-8 mm. 

 long: peduncles 0.5-1 cm. long, leafy; aments coetaneous (?), small, 2-3 cm. 

 long in both sexes; scales oblong or oblanceolate, acutish to truncate, thinly 

 clothed with long white woolly hairs: capsules greenish, 4-5 mm. long; ped- 

 icels 1-1.5 mm. long; styles 0.5-0.7 mm. long; stigmas thick, entire. — ^At 

 middle to high elevations, infrequent; New Mexico to Saskatchewan, west to 

 eastern Oregon and eastern Washington. 



15a. Salix pseudomyrsinites squalls Anders. Leaves smaller, entire, less 

 strongly reticulate: capsules subrostrate, 5-7 mm. long, green or rufescent. 

 Young leafy shoots strongly resemble those of S. Wolfii, . but the leaves differ 

 in being glabrous and less oblanceolate. — Southeastern Wyoming to the Uinta 

 Mountains, Utah, and north to Yellowstone Park. 



