KEY FOR MARCH, APRIL AND MAY 



92 a At least the staminate flowers in aments, spikes, or 



racemes 93 



b Flowers not as in a 97 



93 a Bark of tree peeling off in narrow, vertical strips 



Ostrya. p 142 

 b Bark not peeling completely as in a 94 



94 a Twigs clothed with brownish hairs ; only staminate 



flowers in aments Corylus. p 142 



b Trees or shrubs not completely as in a 95 



95 a Shrubs 8 ft. or less high; pistillate flowers not in 



aments; fruit of waxy nutlets, sometimes present 



Myrica. p 141 

 b Shrubs or trees not completely as in a 96 



96 a Trees with lateral leaf-buds with several scales; leaves 



usually not more than twice as long as broad 



Populus. p 139 



b Trees or shrubs with lateral leaf-buds with a single 

 scale ; leaves usually more than twice as long as broad 



Salix. p 140 



97 a Leaves evergreen, with spiny teeth Ilex, p l8l 



b Leaves not as in a 98 



98 a Flowers solitary or few together in the axils of the 



leaves 99 



b Flowers not completely as in a 101 



99 a Tree with furrowed or checkered bark; leaves entire 



Diospyros. p 198 

 b Shrubs 9 ft. or less high ; leaves wanting or when 



present toothed or entire 100 



100 a Stamens 4 or 5, opposite the petals Rhamnus. p 184 



b Stamens 4-12, not opposite the petals Ilicioides. p 181 



101 a Flowers in panicles 3 in. or more long; leaves entire 



Cotinus. p 181 

 b Flowers not completely as in a 102 



102 a Leaves entire, appearing with the flowers Nyssa. p 194. 



b Leaves toothed or wanting at flowering time 103 



103 a Shrub, often twining; leaves finely toothed .. Celastrus. p 182 

 b Trees, rarely shrubs; leaves usually wanting at flower- 

 ing time 104 



104 a Usually wings of cork at the base of tree; pistil ovoid 



Celtis. p 144 

 b Bark not completely as in a ; pistil 2-lobed at apex 



Ulmus. p 144 



105 a Tree with flowers 2 in. or more broad, orange within ; 



leaves broadly notched at apex Liriodendron. p 152 



b Shrubs or trees not completely as in a 106 



9 



