Ligule / Ligulate

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Ligule:  Literally, a little tongue. The widened and usually flattened, 5-toothed portion of the corolla of a ligulate floret. (Compare with ray.)

Ligulate floret:   In the Asteraceae, a bisexual floret with a ligule.   (Compare with ray floret.)

Ligulate flower head:   In the Asteraceae, a type of flower head that contains only ligulate florets.  That is, all florets of a ligulate flower head are morphologically similar, each including a ligule, a pistil and stamens.

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     Fig. 1. Ligulate flower head of Hieracium paniculatum (Asteraceae).

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                          Fig. 2.  Ligulate flower head of Cichorium intybus (Asteraceae).