Corn mignonette

Reseda phyteuma, is a species of flowering plant in the family Resedaceae. Corn mignonette is present from Central and Southern Europe to Western Asia and North Africa. It is an annual or perennial plant with erect stems, branched at the base. Leaves are entire, the upper ones with two lateral lobes. The inflorescence, which may take up most of the upper stem, is densely packed with many greenish-white flowers with six petals. They bloom from April to late September (Greece).
The pictured plant was spotted in full bloom, in Skyros island, Greece.