KEY FOR MARCH, APRIL AND MAY 



Shrubs or Trees With Simple, Alternate Leaves 

 or Leaves Wanting 



78 a Flowers green or greenish or else without a distinct 



perianth 79 



b Flowers not green, with a distinct perianth 105 



79 a Small tree with smooth, dark-grayish bark, not peeling; 



trunk with smooth, rounded ridges, sinew-like 



Carpinus. p 142 

 b Shrubs or trees not completely as in a 80 



80 a Shrub with leaves indented nearly to the midrib, fern- 



like, fragrant Comptonia. p 141 



b Shrubs or trees not completely as in a 81 



81 a Bark with horizontal markings Vz in. or more long; 



bark peeling in papery sheets or in plates, never fur- 

 rowed Eetula. p 142 



b Bark not completely as in a 82 



82 a Shrubs or trees with the fruiting aments somewhat 



woody and remaining on the tree throughout the 



year Alnus. p 143 



b Shrubs or trees not completely as in a 83 



83 a Trees with smooth, light-gray bark close on trunk, 



not peeling Fagus. p 143 



b Trees or shrubs not completely as in a 84 



84 a Leaves star-shaped, 5-7 pointed Liquidambar. p 163 



b Leaves wanting or not star-shaped 85 



85 a Bark with light-green or whitish patches on upper 



trunk ; flowers in globose balls Platanus. p 163 



b Bark and flowers not completely as in a 86 



86 a Shrub or tree with thorns; pistillate flowers in globose 



head Toxylon. p 145 



b Shrubs or trees not completely as in a 87 



87 a Leaves somewhat fan-shaped, broadest toward apex and 



often incised Ginkgo. p 107 



b Leaves not completely as in a 88 



88 a Milky juice exudes when young twigs are cut 89 



b No milky juice exudes when twigs are cut 90 



89 a Twigs very hairy; pistillate flowers in heads 



Broussonetia. p 145 

 b Twigs not very hairy; pistillate flowers in short spikes 



Morus. p 144 



90 a Leaves more or less lobed 91 



b Leaves entire, toothed, or wanting at flowering time. . 92 



91 a Shrubs 5 ft. or less high; flowers with conspicuous 



perianth Ribes. p 162 



b Shrubs or trees 6 ft. or more high Quercus. p 143 



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