"Diagram of the flower of Saxifrage (Saxifraga tridactylites). The calyx and corolla consist of five parts, the stamens are ten in two rows, while the pistil has only two parts developed. The flower is, neertheless, called symmetrical, although the outer whorls are pentamerous, and the central one dimerous." — Encyclopedia Britanica, 1893

Saxifrage

"Diagram of the flower of Saxifrage (Saxifraga tridactylites). The calyx and corolla consist of five…