Similar concepts:
CGBT: claw = the narrowed base of some petals SSA: claw = the narrow base of a petal, sepal or bract FPW: claw = the narrow basal part of some petals and sepals ATRFT1: claw = the narrowed petiole-like base of a petal or sepal. IPT: claw = the long, narrow, often petiole-like, base of petals and sepals of some flowers.