116 TREES AND SHRUBS 



I. ACER L Maple 



Tree- with reddish, brownish, or grayish twigs, rather smooth 

 bark, and palanjately 5-lobed or 3-foliolate leaves; flowers polyg- 

 amous, just preceding the leaves, inconspicuous, on slender pendant 

 pedicels; petals sometimes present; fruit as described for the family. 



Corymbs long-peduncled; teeth of the leaves 

 acute. 



Leaves, at least most of them 3-parted. 1. A. neomexicanum. 



Leaves merely 3 or 5-lobed, never parted. 2. A. glabrum. 



Corymbs nearly sessile; teeth of the leaves 

 obtuse. 



Lobes of the leaves broadly oblong, with sev- 

 eral teeth, broadest near the apex; wing 

 of the fruit 1 inch long or more. 3. A. grandidentatum. 



2. RULAC Adans. Box Elder 



od -iz< J d tree with pinnate leaves; young twigs smooth 

 and glauc< as, green; leaflets 3, sometimes 5, ovate with a few coarse 

 teeth near the apex or sometimes somewhat lobed. 



1. R. negundo. 



