CupulifercB and Salicaceoe. 
99 
Alnus, Tourn. Alder. 
520. A. incana, Willd. Speckled or hoary alder. 
In low lands along watercourses. Not abundant. 
•CoRYLirs, Tourn. Hazel-nut. Filbert. 
521. *C. Americana, Watt. Wild hazel-nut. 
Common everywhere. 
Ostrya, Micheli. Hop-hornbeam. Iron-wood. 
522. 0. Virginica, Willd. American hop-hornbeam. Lev- 
erwood. 
Of occasional occurrence throughout the region. 
Qttercus, L. Oak. 
523. **Q. alba, L. White oak. 
In all woodlands of the region. With the excep 
tion of Q. coccinea, this is our most abundant oak. 
524. Q. macrocarpa, Michx. Bur oak. Over-cup or 
mossy-cup oak. , 
This species is represented in all parts of the 
region by small clumps or single individuals of 
medium sized trees. 
525. Q. bicolor, Willd. Swamp white oak. 
Low, wet woods about the lakes. Local. 
526. Q. rubra, L. Red oak. 
Forming a considerable element in the older for¬ 
ests of the region. 
527. Q. coccinea, Wang. Scarlet oak. 
Forming the chief element in the oak forests of 
the region. 
Salicaceoe. (Willow Family.) 
Salix, Tourn. Willow. Osier. 
528. S. discolor, Muhl. Glaucous willow. 
Wet places along lakes and watercourses. Com¬ 
mon. 
529. S. humilis, Marsh. Prairie willow. 
Along railroads and on dry wild lands. 
