Dahlia variabilis.

Botanical name: 

Dahlia variabilis Desf. Compositae. Dahlia.

Mexico. The dahlia was first introduced into Spain in 1787, and three specimens reached Paris in 1802. Its petals may be used in salads. It was first cultivated for its tubers but these were found to be uneatable.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.