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 banks of streams and wet places. The plant is erect in habit, branched at the top, otherwise simple, tufted, smooth above, with soft white hairs below. The radical leaves have long stalks, kidney-shaped, scalloped with notched crenatures. The stem-leaves are few, with acute crenatures. The leaves are alternate (hence alternifolum). The flowers are deep-yellow, and form an umbel, or dense cyme, being nearly stalkless. The parts are in fours. The sepals are blunt and spreading. The capsule is nearly inferior, with short beaks. There are 8-12 stamens. The plant is 2-4 in. in height, flowering in April and June, and is a herbaceous perennial.