Longitudinal section of a flower of Lychnis chalcedonica, Maltese Cross. Note the tube of the connate sepals and the distinct petals. A distinctive feature of the Caryophyllaceae is that the petals, stamens, and gynoecium are usually inserted on a stalk called the gynophore (or androgynophore).
Photograph by K.R. Robertson and D. L. Nickrent of plants growing in Champaign, Illinois.