â¢ MORELLO (noun) The noun MORELLO has 2 senses: 1. any of several cultivated sour cherry trees bearing fruit with dark skin and juice. 2. cultivated sour cherry with dark-colored skin and juice. Familiarity information: MORELLO used as a noun is rare.
Petiole. In botany, the petiole is the stalk attaching the leaf blade to the stem. The petiole is the transition between the stem and the leaf blade, and usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules.
Different Sizes. Petioles are various lengths, and some leaves lack petioles entirely. They are called sessile or stalkless leaves -- such as the leaves of wood lily (Trillium sessile), which is hardy in U.S. Department of Agriculture plant hardiness zones 4 through 8.