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 dry pastures, dry sandy fields. The habit is prostrate, then ascending. The stem is softly hairy or silky, spreading. The leaflets are silky, inversely heart-shaped or egg-shaped, entire, stalked, the veins equal and straight at the border. The stipules have reddish veins, and are egg-shaped, membranous, the free portion broadly triangular, the tip bent back. The flowers are small, rose colour, in egg-shaped or oblong, stalkless, terminal, paired, and solitary, axillary heads, broadest below. The tube of the calyx is egg-shaped, swollen in fruit (the teeth not rigid or bent back), ribbed, with a narrow mouth. The calyx-teeth are not so long as the corolla, unequal, short, spiny, triangular to awl-like, 1-nerved, spreading in fruit. The seeds are oval, brownish-yellow, and the radicle is not prominent. The plant is 2-12 in. long, and flowers in June and July, being a herbaceous annual.
The habitat of this plant is dry sandy places, stony pastures, or dry fields. The habit is prostrate, then ascending. The stems are downy, rigid, zigzag, the leaves being borne on short stalks, the leaflets rigid, inversely egg-shaped. The flowers are white, or pinkish-white, borne in terminal or axillary heads, which are egg-shaped, stalkless, the teeth of the calyx being lance-shaped, with 1 strong prominent vein. When in fruit the calyx is cylindrical, the teeth bent back, stiff, and unequal. It is 4-10 in. long, and flowers in May up till July, being an annual and herbaceous.
The habitat of this Clover is gravelly places, commons, sandy pastures, ballast hills. It is a prostrate plant, ascending at the extremities, with smooth, slender, spreading stems. The leaflets are inversely heart-shaped, the egg-shaped stipules or leaflike organs having long points. The flowers are rose-coloured, borne in stalkless heads, which are rounded, terminal, or in the axils. The calyx is stalkless, the acute teeth being 10-veined and egg-shaped. The plant is 6 in. to 1 ft. in length, and flowers in June, being a herbaceous annual.
The habitat of this plant is damp and stiff soils, meadows, moist banks, waste places. The habit is prostrate or ascending. The stem is hairless or thinly hairy, threadlike (hence tenuis). The leaflets are linear, acute, or inversely egg-shaped, lance-shaped with a long narrow point. The stipules are narrow, half egg-shaped. The flowers are small, few, 2-5 in a head, light yellow, the petals turning green when dry. The wings are oblong to inversely egg-shaped, the lower border abruptly curved at the apex. The teeth of the calyx are short, awl-like, closely pressed in bud, the points of the two upper teeth meeting together. The plant is 1-2 ft. high, flowering from July to September, and is a herbaceous perennial.