usually well-developed and leafy, broadly rounded, gland-toothed, 2-10 mm. long, 

 deciduous; petiole mostly 3-15 (-25) mm. long, bearing 2 or more large glands or 

 glandular processes on the upper side at or near base of blade; blades lanceolate 

 to narrowly elliptic, gradually long-acuminate, usually 6-15 cm. long and 1-3 cm. 

 wide, larger on vigorous shoots, finely and closely serrulate with some teeth callous- 

 glandular, blades of the floriferous branches smaller; aments appearing with the 

 leaves, the axis finely and persistently spreading-hairy; scales yellowish, hairy at 

 least on inner surface, deciduous; staminate aments 2-7 cm. long and 1-1.5 cm. 

 thick; stamens 3 to 18, the filaments hairy toward base; pistillate aments 3-12 cm. 

 long; capsules 4-8 mm. long, short-pedicellate, glabrous. S. cauclata (Nutt.) Heller. 

 Along streams, in swamps and marshy thickets, in N.M. (Rio Arriba, Santa Fe. 

 Grant, Socorro and McKinley cos.) and Ariz. (Apache, Navajo, Greenlee. Coco- 

 nino and Gila cos.); Colo, to Yuk., s. to N.M., Ariz, and Calif. 



6. Salix fragilis L. Crack-willow. 



Large tree to 20 m. tall; branchlets greenish to dark-red, glabrous, very brittle 

 at base and deciduous in strong winds; stipules wanting or small, early deciduous; 

 petioles 7-15 mm. long, glandular above at outer end; blades narrowly lanceolate 

 to lanceolate, 7-15 cm. long, 2-3.5 cm. wide, with 5 to 6 glandular serrations per 

 cm. of margin, dark-green above, glaucescent to glaucous beneath, glabrous at 

 maturity; aments coetaneous. slender, lax, 4-8 cm. long, on leafy peduncles to 5 

 cm. long; scales oblong, greenish-yellow, crisp-villous, deciduous; capsules nar- 

 rowly conic, 4-5.5 mm. long, glabrous; styles 0.3-0.7 mm. long, the short stigmas 

 notched. 



Introd. from Eur., occasionally escapes to wettish meadowlands, along streams, 

 pastures and other such places, in Can. and e. and cen. U.S. 



7. Salix Bonplandiana H.B.K. 



Tree to about 12 m. tall, the slender branches drooping; branchlets glabrous or 

 sparsely pilose; petioles stout, reddish, mostly more than 1 cm. long; blades 

 lanceolate to linear-lanceolate, sharply long-acuminate, to about 12 cm. long and 

 1-2 cm. wide, 6 or more times as long as wide, yellow-green and lustrous above, 

 essentially glabrous and silvery-white glaucous on lower surface, serrulate; stamin- 

 ate aments 4—6 cm. long; stamens 3 or more, the free filaments hairy toward the 

 base; scales broadly obovate, light-yellow, villous on outer surface, glabrous or 

 slightly hairy above on inner surface; fruit ovoid-conical, light reddish-yellow; 

 stigmas nearly sessile and club-shaped. Tncl. var. Toumeyi (Britt.) Schneid. 



Banks of streams, on edge of wet meadows, in N. M. (Grant Co.) and Ariz. 

 (Yavapai, Greenlee, Gila, Santa Cruz and Pima cos.); s. to Guat. 



8. Salix laevigata Bebb. Red willow. 



Tree to 15 m. tall, the bark rough; twigs reddish-brown. j,labrous; winter buds 

 5-7 mm. long, pointed; stipules minute, caducous; petioles stout, 4-10 mm. long; 

 blades oblong-elliptic to lanceolate, acute at both ends or obtuse at base, green 

 above, glaucous beneath; staminate aments lax, erect, 3—10 cm. long, the peduncle 

 leafy; stamens 4 to 7, the filaments free; pistillate aments slender, 2-5 cm. long, 

 the peduncle leafy; capsule ovoid. 



In swamps and along streams, in Ariz. (Navajo, Coconino. Mohave, Yavapai, 

 Gila and Cochise cos.); also s.w. Ut., Calif, and Baja Calif. 



Var. araqiiipa (Jeps.) Ball has pubescent young twigs, petioles and bases of the 

 midveins, and often very large leaves. 



9. Salix caroliniana Michx. Long-pedicei.led willow. 



Shrub or tree to 10 m. tall; branchlets and petioles yellowish to dark-brown, 

 sparsely to densely white-pubescent; stipules broadly reniform, 7-15 mm. long, 



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