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n. A division of the perianth of a flower having a virtually indistinguishable calyx and corolla, as in tulips and lilies.

n. One of the component parts of the perianth, the outermost whorls of flower parts, especially when the perianth is not divided into two whorls of unequal appearance.

n. A division of a perianth.

n. In botany, an individual segment of a perianth, whether sepal or petal.

n. an undifferentiated part of a perianth that cannot be distinguished as a sepal or a petal (as in lilies and tulips)

"The ancestral state in other characters is equivocal: e.g., bisexual vs. unisexual flowers, whorled vs. spiral floral phyllotaxis, presence vs. absence of tepal differentiation, anatropous vs. orthotropous ovules."

plant part    plant structure   

sepal    petal