舌 The pinnately Sessile leaves of a In corn the base of the compound leaf of Member of the mustard leaf forms a sheath the pea(Pisum famil around the stem sativumThe pinnately compound leaf of the pea (Pisum sativum). Sessile leaves of a Member of the mustard family. In corn, the base of the leaf forms a sheath around the stem. ￩叶舌 托叶