A synsepal is a floral structure formed by the partial or complete fusion of two or more .
It is common among lady's slipper (Cypripedioideae) that the two lateral sepals are Connation to form a synsepal in the outer whorl. This is located directly behind the pouch, opposite the upward-pointing dorsal sepal.
Synsepals may be bifid, i.e. divided into two equal lobes, or forked and divided in two by a deep cleft.
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