SALICACEAE. it 
SaLix. Willow. 
(Family Salicaceae). 
Shrubs or trees: deciduous. 
Bark at first usually smooth and 
green, gray and more or less fis- 
sured in age. Wood soft, white 
becoming brown, minutely dif- 
fused-porous with fine medullary 
rays, satiny when split. Twigs 
mostly slender, terete: pith rather 
small, roundish, continuous, white. 
Buds mostly small, oblong, ap- 
pressed, sessile, Solitary, with a 
single exposed scale standing im- 
mediately over the leaf-scar, or 
collaterally multiple, the end-bud 
absent. lLeaf-scars alternate or 
exceptionally opposite, low, U- 
shaped: bundle-traces 3: stipule- 
sears short, often absent. 
Willows are particularly diffi- 
cult to name at any time of the 
year by characters which may be 
put in words, but the comparatively few species that enter 
into landscape use to any considerable extent usually differ 
in habit, color of bark, etc., characters which one gardener 
points out to another. 
They illustrate particularly well a type of elongation in 
which each season’s growth is made by the development of an 
axillary bud of the preceding year, the end of the twig dying 
back in winter, as it commonly does in Saliz, or falling early 
in the season by a clean-cut abscission-scar, as in Ulmus, Tilia 
and many other trees, where the scar is small and often pushed 
to one side so as to be likely to be overlooked, and in Ailan- 
thus, where it is particularly large and evident. 
