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Keel is characteristic of the flowers of
A
Bean
B
Gulmohur
C
$Cassia$
D
$Calotropis$
Detailed Solution
In pea and bean flowers (family Fabaceae) there are five petals: the largest (standard) overlaps the two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel).
This arrangement is called vexillary or papilionaceous aestivation; the two anterior petals are fused to form the boat-shaped keel that encloses the stamens and pistil.
Gulmohur and $Cassia$ have imbricate aestivation, and $Calotropis$ has valvate aestivation; they do not have a keel.
Hence the keel is characteristic of the flowers of bean.
This arrangement is called vexillary or papilionaceous aestivation; the two anterior petals are fused to form the boat-shaped keel that encloses the stamens and pistil.
Gulmohur and $Cassia$ have imbricate aestivation, and $Calotropis$ has valvate aestivation; they do not have a keel.
Hence the keel is characteristic of the flowers of bean.