Multiple choice When the leaf base is broad and wing like(to clasp the stem), it is known as Pulvinus Stipule Sheathing leaf base Epicalyx Reveal answer Fill a bubble to check yourself C Correct answer Explanation A sheathing leaf base is broad, wing-like, and wraps around the stem to clasp it. This differs from pulvinus (joint-like thickening), stipule (appendage at leaf base), or epicalyx (accessory calyx whorl).