Claw is found in the petals of

The mustard family (Brassicaceae) consists mainly of annual to perennial herbs with watery acrid juices (having a radish-like peppery taste). They bear alternate leaves, which lack stipules. The stems are often hairy, with forked or star-shaped (stellate) hairs. The calyx consists of 4 separate sepals, and the corolla of 4 petals, that are often separable into a narrow claw at the base, expanded into a broader limb at the upper petal end. Cruciferae, means cross-bearing, by the cross-shaped arrangement of their 4 petals. The perianth consists of a calyx of 4 distinct sepals and typically a corolla of 4 distinct petals that are commonly clawed.