acuminate to acute, closely and finely toothed, eventually glabrous, glaucous 

 beneath, 5-10 (-15) cm. long, 1-3 (-6) cm. wide; aments precocious to coetane- 

 ous, subsessile, terminating short lateral branches, the axis of aments white woolly- 

 villous; scales often glabrous, light-brown to dark-brown or blackish, persistent; 

 staminate aments 2-5 cm. long; stamens 2, the glabrous filaments free or some- 

 what connate below; pistillate aments 3-6 (-9) cm. long; capsules glabrous, 3-7 

 mm. long. S. lutea Nutt. 



In wet meadows and along streams, in N.M. (Lincoln, Otero, San Miguel and 

 Valencia cos.) and Ariz. (Apache to Coconino and Yavapai cos.); Nfld. and Que., 

 s. to Va., w. to Yuk., B.C., Wash., Calif., Ariz, and N.M. 



19. Salix myrtaiifdlia Anderss. 



Much-branched shrub to about 1 m. tall, rarely somewhat arborescent and to 

 4 m. taJl; twigs minutely hairy; stipules insignificant, deciduous; petioles seldom 

 to 1 cm. long; blades firm, hairy when young but soon essentially glabrous, 

 elliptic-oblanceolate to elliptic-obovate or elliptic, obtuse to subacuminate, finely 

 and often glandular-crenate-serrate to entire, mostly 3-7 cm. long and 1-2 cm. 

 wide, green but somewhat pale beneath; aments coetaneous, on short leafy 

 peduncles to about 1 .5 cm. long; scales persistent, brown or blackish, thinly white- 

 pilose or at least more or less hairy within; staminate aments 1—2 cm. long; sta- 

 mens 2, the glabrous filaments usually free; pistillate aments 2-4 cm. long; style 

 evident; capsules glabrous, 3-6 mm. long, ovoid-attenuate, with pedicels about 1 

 mm. long. S. pseudocordata Anderss. 



Wet meadows and wet open slopes, forming thickets in marshy ground, in 

 N. M. (Taos Co.) and Ariz. (Apache and Navajo cos.); Nfld. to Alas., s. to 

 N.M., Ariz, and Calif. 



20. Salix monticola Bebb. ex Coult. 



Shrub to about 4 m. tall; twigs mostly yellowish, short-hairy when young, 

 becoming glabrous with age; stipules small, deciduous; petioles 5-10 (-15) mm. 

 long; blades elliptic to elliptic-obovate, obtuse to acute or even subacuminate at 

 apex, 3.5-8 cm. long, 1-3 cm. wide, hairy when young but becoming glabrate 

 with age, glaucous beneath, crenate-serrate to subentire; aments coetaneous or 

 subprecocious, essentially sessile on short peduncles to 1 cm. long, often subtended 

 by small leafy bracts to 1.5 cm. long; scales dark, long-hairy, persistent; staminate 

 aments 2-3.5 cm. long; filaments 2, glabrous, free to base or sometimes connate 

 below; pistillate aments 2-6 cm. long; capsules glabrous, 4-7 mm. long, on a 

 pedicel 1 mm. long; style 0.7-1.8 mm. long, longer than the somewhat bilobed 

 stigmas. 5. pseudomonticola Ball, S. padophylla Rydb. 



On stream banks and edge of wet meadows, in N. M. (San Miguel and Santa Fe 

 cos.) and Ariz. (Apache Co.) ; Sask. to Alta., s. to N.M. and Ariz. 



21. Salix Bebbiana Sarg. Beaked w^illow. 



Shrub or small tree 2-5 m. tall, with 1 to several stems; branchlets slender, 

 divaricate, brownish, pubescent to glabrate; stipules wanting or small; leaf blades 

 elliptic and acute at both ends to broadly rhombic-oblanceolate to obovate-oval, 

 abruptly short-acuminate and rounded at base, 4-7 (-10) cm. long, 1.5-3 (-4) 

 cm. wide, subentire to undulate-crenate, glaucous and rugose beneath, more or less 

 gray-pubescent on both surfaces; aments subprecocious; staminate aments small 

 and subsessile; stamens 2, the slender filaments free; pistillate aments 2-7 cm. 

 long, very lax, on bracted peduncles 5-20 mm. long; scales narrowly oblong, acute, 

 1-2 mm. long, greenish-yellow with reddish tips, pilose; capsules lanceolate- 

 rostrate, 7-10 mm. long, finely pubescent; styles 0.1-0.2 mm. long; stigmas 

 0.1-0.3 mm. long, entire to divided. 



765 



