KEY TO THE COMMON SHRUBBY WILLOWS 321 



They are so easily raised from slips placed in the ground that they are, 

 in cultivation, raised only that way. So, any sport or variety found any- 

 wliere is introduced into cultivation and perpetuated w^ithout the origin 

 being known. The soft wood, alternate simple leaves, and flowers of both 

 sorts, always in catkins in spring or summer, are enough to enable any 

 one to separate willows from all other plants. 



KEY TO COMMON SHRUBBY WILLOWS, BASED ON 

 LEAF PECULIARITIES 



* Leaves about entire-edged and more or less conspicuously whitened 



below. (A.) 

 A. Leaves under i inch wide. (B.) 

 B. Leaves under 2 inches long and almost sessile. Dwarf Gray 



Willow (5(38) — Salix tristis. 

 B. Leaves 2-5 inches long. One of the willows used to graft on 



goat willow stock to produce an umbrella tree. Rosemary 



Willow (5(39) — Salix incana. 



B. Leaves 4-10 inches long and beautifully silvery. One of the 

 willows used in basket work. Osier Willow (570) — Salix 

 viminalis. 



A. Leaves ^-| inch wide and more or less rolled at the edges. (C.) 



C. Leaves rarely over 2 inches long ; twigs slender, smooth, pale 

 brown. A low willow 1-3 feet high gi'owing in bogs. Bog 

 Willow (571) — Salix myrtilloides. 



C. Leaves 2-4 inches long ; twigs and leaves, when young, densely 

 covered with white woolly substance. Like the last, a low wil- 

 low 2-5 feet high, in wet bogs. Sage Willow or Hoary Wil- 

 low (572) — Salix Candida. 

 C. Leaves 2-4 inches long, grayish and peculiarly veined. A wil- 

 low 3-8 feet high growing in dry soil. Prairie Willow 

 (573) — Salix hiimilis. 

 A. Leaves |-li inches wide. Glaucous Willow — Salix discolor. 

 (Placed here as it sometimes has entire-edged leaves, though 

 usually with notched ones.) 



* Leaves notched at the edges. (D.) 



D. Leaves conspicuously of two colors, decidedly whitened below. 



(B-) 

 E. Leaves frequently 2 inches wide, shining dark green above, 

 glaucous below*; twigs light gray. A willow 2-0 feet high, 

 abundant on the sands of the shores of the Great Lakes. 

 Broad-leaved Willow (574) — Salix glaucophylla. 



APGAIl's SHRUBS — 21 



