1), about a third the total length of the mericarp (Zona et al.
The results of my own experiments with mericarp floatation are shown in Table 1, in which mericarps are shown to float for at least 24 hours, long enough to be carried by water over a considerable distance.
Although Weckerle and Rutishauser (2005) have described the structure of the gynoecium and the fruit ontogenesis of nine Paullinieae species including Urvillea ulmacea, detailed descriptions and illustrations concerning the separation system of mericarp and of dehiscence are lacking.
Houssayanthus, Lophostigma and Serjania are characterized by schizocarpic fruit with winged (samaroid) mericarps, Cardiospermum and Urvillea, by papery, inflated capsules, and Paullinia by capsules.
In Euphorbiaceae each mericarp separates from the adjacent mericarps as well as from the central column, when the fruit dries out, dehiscing abruptly along the dorsal suture, so that the seeds are thrown far away (ROTH, 1977).