Noun
A division of a perianth.
Source: Webster's dictionaryThe inner flower segments are usually marked with a green, or greenish-yellow, bridge-shaped mark over the small " sinus " (notch) at the tip of each tepal. Source: Internet
Magnolia shares the tepal characteristic with several other flowering plants near the base of the flowering plant lineage such as Amborella and Nymphaea (as well as with many more recently derived plants such as Lilium ). Source: Internet