KEY FOR MARCH, APRIL AND MAY 



138 a Flowers on branched stalks in lateral umbels 



Prunus pseudo-cerasus. p 170 

 b Flowers 2-4 together, not on branched stalks 



Amygdalus pumila. p 170 



139 a Pistils 5; ovaries superior; flowers white.Exo chorda, p 164 

 b Flowers not completely as in a 140 



140 a Style i to each flower ; ovary superior 141 



b Styles 3-5 to each flower; ovary inferior 142 



141 a Flowers pink Amygdalus persica. p 170 



b Flowers white Prunus. p 169 



142 a Flowers in racemes; wild shrubs Amelanchier. p 168 



b Flowers in lateral or terminal cymes, not in racemes. . 143 



143 a Ovary woolly; tree cultivated for the fruit 



Cydonia vulgaris. p 168 

 b Ovaries not woolly 144 



144 a Shrub or small tree cultivated for the flowers 



Malus floribunda. p 169 

 b Shrubs or trees cultivated for the edible fruit 145 



145 a Flowers pink to white, the petals usually pink on the 



outside Malus. p 168 



b Flowers white, the petals not pink on the outside. Pyrus. p 167 



146 a Corolla deeply saucer-shaped, 5-lobed, with 10 pouches 



on the tube Kalmia. p 195 



b Corolla not completely as in a 147 



147 a Trailing shrubs 148 



b Erect trees or shrubs 151 



148 a Flowers about Mi in. long, hairy within, very fragrant 



Epigaea. p 195 

 b Flowers not completely as in a 149 



149 a Leaves %-i in. long; ovary superior. .Arctostaphylos. p 195 

 b Leaves about ^ in. long; ovary inferior 150 



150 a Flowers white, solitary at the ends of the branches 



Pyxidanthera. p 196 

 b Flowers pink, in clusters of 2-6 Oxycoccus. p 196 



151 a Flowers 1-2 in. broad 152 



b Flowers % in. or less broad 153 



152 a Corolla conspicuously 2-lipped ; stamens 10; wild shrub 



Rhodora. p 195 

 b Corolla only slightly 2-lipped; stamens usually 5; wild 



or cultivated shrubs Azalea, p 195 



153 a Small tree planted in parks; flowers bell-shaped, %-% 



in. long, white Mohrodendron. p 198 



b Shrubs not completely as in a 154 



154 a Leaves thick, evergreen 155 



b Leaves thin, deciduous 157 



12 



