caducous

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English - English
Of a part of an organism, disappearing in the normal course of development

The Jubulaceae have a leaf whose lobule, usually transformed into a water-sac, is normally very narrowly attached to the stem and to the dorsal lobe; indeed some Frullania taxa reproduce vegetatively by dropping the dorsal lobes, but not the lobules, and Neohattoria has caducous lobules but persistent lobes.

{a} falling at the first opening off the flower, or before the end of summer
Dropping off or disappearing early, as the calyx of a poppy, or the gills of a tadpole
shed at an early stage of development; "most amphibians have caducous gills"; "the caducous calyx of a poppy"
shed at an early stage of development; "most amphibians have caducous gills"; "the caducous calyx of a poppy
{s} falling off at an early stage of development (Biology)