SALICACEAE (WILLOW FAMILY) 133 



lanceolate 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 

 serrulate: 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 united 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 cuspidate 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, thin, 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, flexuous, 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. 1. c. 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 Yellowstone 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 equalis 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. 



