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 waste sandy places. It is a weed of cultivated and waste ground. Dry places, sandy and chalky fields are also the habitat of this species. The habit is erect. The stems are branched from the base. The plant is hairy or smooth. The leaves are small, stalked, rounded, cut, scalloped, in distant whorls, the lower ones long-stalked, lobed, the base rounded or heart-shaped, wrinkled, the upper stalkless, clasping (hence amplexicaule). The flowers are purplish-red, the lower in distant whorls. The bracts are stalkless, broader than long, the bases overlapping. The calyx-teeth meet in fruit, and are as long as the tube, or longer, green. The corolla is long, slender, sometimes imperfect, straight, downy, very slender, with no hairs within. The nutlets are small, smooth, three times as long as broad. The plant is 4-12 in. high, flowering from May to August, and is a herbaceous annual.
This species is found in waste places near gardens, in which it is much cultivated. The plant is allied to L. album, but differs in the calyx and corolla, and has fewer rarely white flowers. The stem is hairy or smooth. The leaves are heart-shaped to ovate, narrow-pointed, deeply toothed, scalloped, all stalked, marked with white or green, triangular to heart-shaped, wrinkled, hairy or downy. The flowers are purple, with transverse hairs in the curved equal corolla-tube, narrowed below, enlarged in the throat. The calyx-teeth are broad, bent-back as long as the tube, which is oblique, or longer. The corolla exceeds the calyx. The anthers are hairy. The plant is 6-18 in. high, flowering from May to September, and is a herbaceous perennial.
The habitat of this species is waste places. The plant has an agreeable scent. The calyx-teeth are lance - shaped, gradually acuminate, erect. The plant is softly hairy. In other respects it resembles the last. It is 2-3 ft. high, flowering in July and August, and is a herbaceous perennial.
The habitat of this plant is marshes. The stem is hairy. The leaves are spreading, thick, ovate, acute, coarsely toothed, with a few hairs above, and more on the veins below. The upper leaves are the same. The Alpine Poa (Poa alpina, L.) - The habitat of this species is rocks, lofty mountains. The plant has the grass habit. It is smooth. The stout rootstock is tufted and creeping. The stems are stout, smooth, round in section, covered with the sheaths of last year. The leaves are broad, firm, the tip rounded, folded, short, stiff, rigid, keeled, shortly blunt-pointed, the edges thick and rough, the upper shorter than the sheath. The persistent lower sheaths are white, broad, membranous, leafless, the upper smooth, flattened. The long ligule is pointed, torn, acute. The uppermost node is exposed. The panicle is loose, pyramidal, oblong, erect, spreading in flower, the branches 2-nate. The spikelets are green and purplish, 4-5 flowered, ovate, often viviparous. The flowering glumes are 3-9, with a downy keel and margin, with 3-5 obscure veins. The tips are membranous, webbed, broad. The plant is 4-12 in. high, flowering in July and August, and is a herbaceous perennial.