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.
This is an alien found at Penzance and Ilsington, in gardens and waste places. The habit is like that of the last, but erect, with numerous runners, and nearly smooth. The leaves are imperfectly whorled. There are small stipules, or they may be absent. The flowers are yellow, in close terminal cymes, the flower-stalks bearing 2-8 flowers, longer than the leaves, the fruiting stalks spreading or erect. The capsules are smooth. The plant is 6-18 in. in length, and flowers between June and September, being a herbaceous biennial or annual.
The habitat of this plant is waste, shady places and waysides. The habit is branched, prostrate. The stem is downy, without runners, slender. The stem-leaves in pairs are trifoliate, the leaflets inversely heart-shaped, the stipules oblong, parallel with the stem, united to the base of the stalk. The flowers are small, yellow, the flower-stalks in the axils 2-flowered, in a sort of umbel, not so long as the leaves, the fruit-stalks turned back. The capsules are downy, long, the seeds ribbed transversely. The plant is 6-18 in. in length, and flowers from June to September. It is a herbaceous annual.
This species is found in waste places and woods. The plant is erect. The leaves are elliptic to ovate, toothed, with a long, narrow point, acute both ends. The flowers are small, pale yellow, on erect stalks, with 3-12 flowers. The spur is short and straight, formed by the posterior sepal. The plant is 1-2 ft. high, flowering from July to September, and is a herbaceous annual.
The habitat of this plant is riversides and waste places. The stem is stout. The flowers, which are rose-purple and pink, are large. The plant is 3-5 ft. high, flowering from July to October, and is a herbaceous annual.