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 species is stony places, slopes near the base of hills. The habit is trailing, prostrate, shrubby. The stem is branched, prostrate, hoary, downy both sides, with stipules. The leaves have bent or rolled-back margins, and are opposite, with stipules, egg-shaped to oblong, linear. The flowers are white, in racemes, with bracts on the stalks. The sepals are downy, the inner blunt. The style is bent below, longer than the ovary. The plant is 8-10 in. high, flowering from May to July, and is a perennial under-shrub.
The habitat of this plant is stony, heathy places. The habit is erect. The stem is hoary or downy, simple or forked, and branched from the base, without bracts. The leaves are oblong to lance-shaped, linear, the lower leaves are opposite, the upper alternate, with stipules. The flowers are yellow, with deep-red or chocolate spots below (hence guttatum). The petals are wedge-shaped. The fruit-stalks are spreading, without bracts. The stigma is nearly stalkless. The plant is 4-12 in. high, flowering between May and August, and is a herbaceous perennial.
The habitat of this species is dry banks, rocks, limestone rocks. The habit is prostrate, shrubby. The stem is woody, much-branched, hoary (hence canum), with stipules. The leaves are hoary both sides, or hairy above, egg-shaped, oblong, stalked, flat, opposite. The flower-stalks bear bracts. The flowers are few, small, yellow, in terminal racemes with bracts. The style is twisted below, bent back at the tip, bent in, longer than the stigma. The anthers are notched both ends. The plant is 6-8 in. long, flowering from May to July, and is a perennial shrub.