Oleander (Nerium oleander) is a poisonous if beautiful shrub with lance-shaped, veined, grey-green leaves. It grows wild along river courses and stream beds. Its fragrant flowers appear in late spring to early summer and are white or red, single or double, depending on the variety.
Bibliography
Trees and shrubs of the Mediterranean by Helge Vedel, translated from the Danish by Aubrey Rush (Penguin Guides, 1978), p.78.