128 PLANT STRUCTURES 
An exceptional use of petals, where indeed they 
are used for the purposes of advertisement, but to 
secure the dispersal not of the pollen, but of the 
seeds, is illustrated in Fig. 24. In the genus Coriaria 
the staminate and pistillate organs are borne on 
separate flowers. The flowers of both kinds are small . 
and inconspicuous. But in the “female” flowers the 
FIG. 24.—FRUIT OF CORIARIA JAPONICA. }. 
petals persist after flowering, and, becoming fleshy 
and comparatively large, enclose the seed in a pulpy 
berry-like envelope, which no doubt serves the same 
purpose as a true berry in securing seed-dispersal by 
being devoured by birds. In C. terminalis, which 
comes from the Himalayas, the “ripe” corolla is 
bright orange; in C. japonica, from Japan, it is at 
first coral-red, and when mature velvet-black. 
