Easter eggplant

Easter Eggplant, is a plant of Nightshade family, related to aubergine (=S.melongena); Stem and leafstalks are green, or very faintly tinged with purple, and bear a few white spines. Leaves are wavy at the edges. Flowers are lilac, it is recognized by its oblong fruit, also grown as an ornamental plant, for covering walls or trellises.

Other websites

 * http://encyclopedia.jrank.org/ARN_AUD/AUBERGINE_diminutive_of_Fr_aube.html
 * http://edis.ifas.ufl.edu/MV061
 * Solanaceae in stamps