portion of a pine tree which secures the needles together in characteristic clusters of two. three. or five.

fascicle sheath (Wikipedia)

In botany, a fascicle is a bundle of leaves or flowers growing crowded together; alternatively the term might refer to the vascular tissues that supply such an organ with nutrients. However, vascular tissues may occur in fascicles even when the organs they supply are not fascicled.

Fascicled flowers of Butea monosperma, (Flame of the forest)
Details of fasciculation of florets in an inflorescence of a Sansevieria species
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