Stace describes this plant as having the following characteristics:
- Upright, to 40 cm; softly hairy, with hairs at more-or-less right-angles to the stem.
- Flowers grey-blue, 3-5mm across, saucer shaped in profile; sepal tube with hooked hairs; April–October.
- Mature fruit dark brown, shiny.
- Mature calyx on spreading stalks longer than sepal tube; calyx teeth conceal the ripe fruit.
- Basal leaves stalked, in a rosette; upper leaves not stalked.
- Generally found on open, well drained ground; common throughout the British Isles.
- New Flora of the British Isles; Clive Stace; Third edition; 2011 printing
- The Wild Flowers of Britain and Northern Europe; Fitter, Fitter, Blamey; Collins; 3rd edition 1978