Quickly falling (as in leaves)

shed at an early stage of development; "most amphibians have caducous gills"; "the caducous calyx of a poppy"

any organ falling at a certain stage of development.

Falling off early in development, as in the sepals of some Papaveraceae.

shed easily.

a. (L. caducus, falling, from cadere, to fall) said of a plant part, such as a sepal, petal, or leaf, that falls off quickly or early.

fleeting; falling

Falling off at an early stage.