50 WOODY PLANTS 



in diameter; 



yellowish-brown 



to brown; buds small, 



1-3 (-4)mm. long 18. S. tristis 



d. Buds midsized to large, 4-8 

 (-10) mm. long, pubescent 



e. Introduced shrub or small 



tree, bark gray; 1-2 year 



twigs yellowish, older dark 



brown, stoutish 15. S. caprea 



e. Native shrubs or small 



trees; bark brown ;twigs 



mostly reddish-brown to 



dark brown 



f. Few-stemmed shrub 

 or small tree, 2-7 m. 

 high; bark brown ;young- 

 er twigs often pubescent 

 (more densely so in var. 

 latifolia), older glabrous, 

 stoutish 16. S. discolor 



f. Sprangly shrub 1-3 m. 

 high; bark brown; 

 twigs midsized, pubes- 

 cent, younger yellow- 

 ish 17. S. humilis 



b. Buds opposite, subopposite, or al- 

 ternate (on same twig), midsized 

 to large, 3-8(-9)mm. long, glabrous 

 (introduced shrub) 20. S. purpurea 



1. S. lucida Muhl. Shining Willow . Shrub or small tree 

 3-6 (-9)m. high7 tne trunk to 1. 2 dm. in diameter; bark brown, 

 glabrous; twigs mostly midsized (2-5 mm. in diameter), chest- 

 nut-brown to reddish-brown or darker, glabrous or young twigs 

 more or less hairy (var. intonsa Fernald); buds midsized, 4-6 mm. 

 long, colored and clothed as the twigs; leaf-scars lunate; bundle- 

 traces conspicuous. Low grounds, Delaware to Iowa and North 

 Dakota, north to Newfoundland and west to Manitoba. 



2. S. serissima (Bailey) Fernald. Autumn Willow . Shrub 

 1-4 m. high, branches with olive-brown, lustrous bark, twigs 

 slender, yellowish-brown to brown, shining, glabrous; buds mis- 



