Legousia speculum-veneris, the looking glass[1] or large Venus's-looking-glass,[2] is an annual ornamental plant in the family Campanulaceae (bellflowers).

Legousia petal bases are straight (not bell-based as Campanula).

L. speculum-veneris flowers have a 5-part calyx under the flower-base with long very narrow arms, roughly equal to the petals and to the ovary (which appears at first like a stalk to the flower and in maturing swells).

The flowers lack the broad blue central band of L. pentagonia (found from Greece eastwards), which has comparatively shortened calyx arms.

However the Eastern Mediterranean has forms transitional between L. speculum-veneris and L. pentagonia suggestive of gene flow.