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 plant has the rosette habit. The aerial stems are scapes. The leaves are radical, wrinkled, the leaf-stalks winged, the leaves egg-shaped, narrowed below. The flowers, are pale-yellow, in umbels on flower-stalks, the calyx tubular, softly hairy, with lance-shaped teeth, and the flowers are horizontal or drooping. The limb of the corolla is concave, broad, and flat, the tube is not crowned or narrow at the mouth, the throat open not folded. The capsule is oblong, linear, and longer than the calyx. The plant is 4-12 in. high, and flowers in April and May, being a herbaceous perennial.