KEY FOR MARCH, APRIL AND MAY 



122 a Shrubs or trees with spines or thorns on the branches 123 

 b Shrubs or trees not with spines or thorns on the 



branches 128 



123 a Leaves evergreen; flowers about % in. broad 



Cot one 'aster, p 167 

 b Leaves not evergreen ; flowers % in. or more broad 124 



124 a Shrub 2-6 ft. high; flowers 1-2 in. broad, scarlet to 



white Cydonia. p 168 



b Shrubs or trees 6 ft. or more high 125 



125 a Ovary superior Prunus americana. p 169 



b Ovary inferior 126 



126 a Flowers i in. or less broad Crataegus. p 167 



b Flowers 1-2 in. broad 127 



127 a Flowers white Pyrus. p 167 



b Flowers pink or rose-colored Mains ftoribunda. p 169 



128 a Leaves round-ovate; flowers %-% in. broad, in corymbs 



Sorbus aria, p 167 



b Leaves and flowers not completely as in a ... 129 



129 a Flowers V^-Vz in. broad 130 



b Flowers %-2 in. broad 135 



130 a Shrubs cultivated for their flowers 131 



b Shrubs or trees not cultivated for the flowers 133 



131 a Leaves round-ovate, heart-shaped at base, fragrant, 



appearing with the flowers Prunus mahaleb. p 169 



b Plants not completely as in a 132 



132 a Leaves lobed usually below the middle, the middle lobe 



often notched at the apex, flowers on slender stalks; 



ovary inferior Mains toringo. p 168 



b Leaves and flowers not completely as in a ..Spiraea, p 163 



133 a Shrub 1-3 ft. high; flowers in racemes; ovary inferior; 



leaves oval, usually rounded at both ends 



Amelanchier spicata. p 1 68 

 b Shrubs or trees not completely as in a 134 



134 a Flowers in terminal, compound cymes; ovary inferior 



Aronia. p 168 

 b Flowers in lateral umbels or racemes; ovary superior 



Prunus. p 169 



135 a Flowers double, pink or rose-colored, usually appearing 



with or before the leaves 136 



b Flowers not double 139 



136 a Flowers appearing before the leaves, usually solitary 



Amygdalus pedunculata. p 170 

 b Flowers appearing with the leaves, not solitary on the 



branch 137 



137 a Flowers in terminal cymes Mains spectabilis. p 169 



b Flowers not in terminal cymes 138 



ii 



