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130
Leaf-stalk <1 cm and
leaf-blade to 3 cm long
Rhamnus saxatilis
Jacq.
131
Ovary superior, visible
at the bottom of a cup-
shaped receptacle.
Fruit with a bluish-
white bloom, with a
single stone
Prunus spinosa L.
131
Ovary inferior,
completely surrounded
by the receptacle. Fruit
without a bluish-white
bloom, with several
seeds
Pyrus pyraster (L.)
Burgsd.
132
Leaves more or less
triangular or rhombic
in outline
133
132
Leaves not triangular
nor rhombic in outline
134
133
Leaf-margin with
dense acute teeth. Bark
white and papery.
Fruits not a capsule, in
structures resembling
catkins
Betula pendula Roth
133
Leaf-margin with
sparse blunt teeth.
Bark not papery. Fruits
capsules, in racemes
Populus nigra L.