Carpel Dehiscence in Firmiana Simplex

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Abstract
This plant shows a condition intermediate between the open and closed carpel and between the apocarpous and the syncarpous pistil. In the young carpel, the 2 rims nearly meet, but there is a distinct narrow slit between. The suture continues to widen after the earliest stages. Later the cells near the margins of the suture and those of the placental bundles continue to enlarge and divide, bringing the margins together. The epidermal cells of the margins divide tangentially to the line of the suture, effecting complete coalescence. When the carpel reaches 7 cm. in length, active cell division ceases and the carpel breaks open by a mechanical rupture of the new tissue. During the development and elongation of the style, both the epidermal cells and those near the ventral surface of each carpel primordium divide, and the 5 carpels coalesce in the stylar region.

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