This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
The habitat of this plant is margins of rills and rocky places. The habit is the rosette habit. The stem is erect. The radical leaves are spoon-shaped, inversely egg-shaped, blunt, the upper oblong to lance-shaped, acute. The flowering stems from the axils of the rosette are simple and short. The flowers are bluish-white, in terminal racemes, the inner sepals oblong, inversely egg-shaped, narrower and longer than the capsule, the nerves simple, or slightly branched, free. The lateral bracts are shorter than the flower-stalks. The capsule is rounded below, notched. The lobes of the aril are nearly equal, blunt, half as long as the seed. The plant is 1-3 in. long, flowering from April to July, and is a herbaceous perennial.