The sepals are green and much smaller than the white petals.
The calyx is tightly closed, although the tips of the sepals are spread widely.
Stamens 5, inserted on the sepals, with double or irregular anthers.
Calyx inferior, funnelform, with 4–5 sepals as long as the corolla.
They occur normally in the sepals of Paronychia serpyllifolia and other plants.
The ten ridges ...