calyx tube

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Noun1.calyx tube - the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae)
plant organ - a functional and structural unit of a plant or fungus
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References in periodicals archive ?
In the dry condition, the persistent calyx is pointed downward and the inner epidermis of the calyx contracts, constricting the calyx tube and pulling together the two lips of the calyx.
In the springboard or catapult mechanism, the fruit or persistent calyx tube (or gemmae in the case of Kalanchoe tubiflora; Brodie 1955) is attached to the stem by a resilient pedicel, which is bent downward by falling raindrops and, as it recoils upward, seeds are dispersed.