Ligule

A ligule is also a strap-shaped extension of the corolla, such as that of a ray floret in plants in the daisy family Asteraceae.

A ligule can also be defined as a membrane-like tissue or row of delicate hairs typically found in grasses at the junction of the leaf sheath and blade.

The three basic types of ligules are: membranous, a fringe of hairs (ciliate), and absent or lacking.

In grass-like plants such as sedges (Cyperaceae) and rushes (Juncaceae), ligules are usually absent or poorly developed.

[2] The microphylls of Lycopodiophyta of the families Selaginellaceae (spikemosses or lesser clubmosses) and Isoetaceae (quillworts) have minute, scale-like flaps of tissue called ligules at the base of the upper surface of each leaf blade.