SALIC ACE AE 19 



5. Leaves coarsely toothed rather than lobed. P. alba. 

 Leaves deeply lobed. P. alba nivea. 



6. Leaves glabrate, subserrulate. P. tremuloides. 

 Leaves somewhat pubescent, coarsely toothed. 7. 



7. Buds gray-pubescent. P. grandidentata. 

 Buds glabrate. 8. 



8. Not weeping. P. Tremula. 

 With hanging branches. P. Tremula pendula. 



9. Leaves pale beneath: petioles little flattened: buds 



mostly very balsamiferous. (Balsams). 10. 

 Leaves green beneath: petioles much flattened: buds 

 less balsamiferous. (Cotton woods). 14. 



10. Leaves deeply heart-shaped, broad. ,P. candicans. 

 Leaves scarcely heart-shaped. 11. 



11. Leaves elliptical or ovate. 12. 

 Leaves lanceolate. 13. 



12. Leaves flat. P. balsamifera. 

 Leaves wavy. P. laurifolia. 



13. Twigs sharply angled. P. Lindleyana. 

 Twigs not angled. P. fortissima. 



14. Tree round-topped. 15. 



Tree oblong, (Carolina poplar). X P. Eugenei. 



Tree pyramidal. (Lombardy poplar). P. nigra italica. 



15. Leaves rather cuneate and attenuate. P. nigra. 

 Leaves deltoid. 16. 



16. Buds glabrous. (Eastern c.). P. deltoides monilifera. 

 Buds velvety. (Western cotton wood). P. Sargentii. 



SALIX. Willow. Osier. 



Deciduous shrubs or trees with light brown wood with 

 numerous minute scattered ducts and very fine medullary 

 rays; round continuous pale pith; chiefly alternate sessile 

 appress<ed oblong buds with a single exposed scale standing 

 directly over the leaf-scar, the end-bud lacking; shallow U- 

 shaped or transverse low leaf-scars with 3 bundle-traces ; small 

 if any stipule-scars; usually narrow rather small short-petioled 



