The difference between Catkin and Raceme
When used as nouns, catkin means a type of inflorescence, consisting of a slender axis with many unisexual apetalous flowers along its sides, as in the willow and poplar, whereas raceme means an indeterminate inflorescence in which the flowers are arranged along a single central axis.
check bellow for the other definitions of Catkin and Raceme
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Catkin as a noun (botany):
A type of inflorescence, consisting of a slender axis with many unisexual apetalous flowers along its sides, as in the willow and poplar.
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Raceme as a noun (botany):
An indeterminate inflorescence in which the flowers are arranged along a single central axis.