STANDLEY— FLORA OF GLACIER PARK. 319 



2. SALIX L. Willow. 

 (Contributed by Mr. C. R. Ball.) 



Plants perennial, low and spreading to taller and erect, shrubs or small trees; bark 

 bitter; bud scales single; leaves alternate, usually with stipules; flowers of the two 

 sexes on different plants, in sessile or leafy-peduncled catkins, appearing before or 

 with or after the leaves; flower scales yellow, brown, or black, entire or occasionally 

 shallowly toothed at apex; fruit a dry, glabrous or pubescent capsule, lanceolate to 

 lanceolate-ovoid, of 2 valves recurving at maturity; seeds minute, with a dense tuft 

 of long silky hairs at the base; stamens usually 2 (3 to 8 in Nos. 1, 2, and 3). 

 Scales pale yellow, deciduous. Styles about 0.3 to 0.5 mm. long; leaves .linear- 

 lanceolate to broadly lanceolate, more than 5 cm. long. 

 Leaves closely and finely toothed; petioles distinct; catkins solitary; stamens 

 3 to 8. 

 Petioles glandular at upper end; capsules 6 to 9 mm. long. 



Flowers in early summer; leaves green beneath 1. S. caudata. 



Flowers in late summer; leaves white beneath 2. S. serissima. 



Petioles never glandular; capsules 4 to 5 mm. long 3. S. amygdaloides. 



Leaves remotely and irregularly toothed; petioles gradually merging into leaf 

 blades; catkins often in pairs; stamens 2. 

 Leaves linear, light green or gray-green; teeth few to numerous, long, slender, 



sharp; capsules short-pediceled 4. S. interior. 



Leaves narrowly elliptic, dark green; capsules sessile or subsessile. 



5. S. melanopsis. 

 Scales brownish, at least at the tip (yellow in Nos. 13, 14, and 20, but then persistent, 

 and the leaves and capsules hairy). 

 Capsules glabrous. Catkins appearing with the leaves. 

 Leaves lanceolate or oblanceolate, acuminate, glabrous; styles about 0.5 mm. 

 long. 

 Leaves glaucous beneath. 



Leaves 2 to 5 cm. long; pedicels 1 mm. long 6. S. farrae. 



Leaves mostly 5 to 7 cm. long; pedicels 2 to 4 mm. long 



7. S. mackenziana. 



Leaves green beneath 8. S. pseudomyrsinites. 



Leaves elliptic-lanceolate or oval-lanceolate to oval, acute or obtuse; styles 

 1 to 2 mm. long. 



Leaves glabrous. Catkins nearly sessile 9. S. pseudomonticola. 



Leaves tomentose. 

 Catkins on leafy peduncles; styles about 1 mm. long . . 10. S. commutata. 



Catkins sessile; styles about 2 mm. long 11. S. barrattiana. 



Capsules hairy. 



Styles elongate, 1 to 1.5 mm. long. 

 Leaves more or less woolly on both sides. 

 Plants ascending or erect, 0.2 to 2 meters high. 

 Styles 1.5 to 2.5 mm. long; catkins large, sessile . ... 11. S. barrattiana. 

 Styles 1 to 1.5 mm. long; catkins leafy-peduncled. 

 Leaves linear-oblong, 4 to 10 cm. long, white-woolly on both sides. 



12. S. Candida. 

 Leaves elliptic or elliptic-oblong, 2 to 6 cm. long. 



Catkins 1 to 1.5 cm. long; leaves and twigs yellow-woolly. 



13. S. brachycarpa. 

 Catkins 1.5 to 5 cm. long; leaves gray-woolly, glaucous beneath. 



14. S. glaucops glabrescens. 



