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 marshes.. The habit is erect. The rootstock is branched. The stems are simple, stout, hollow, angled, leafy. The leaves are long, linear to lance-shaped, acutely arrow-shaped, with a long, narrow point, finely toothed, the lower leaves long, with 2-4 linear-lance-shaped lobes, runcinate, with the lobes bent backwards, or with one arrow-shaped blade and a broad winged leaf-stalk, bluish-green below. The upper leaves are entire, arrow-shaped, stalk-less, with acute auricles. The flowerheads are pale lemon, in a sort of umbel, glandular, hairy, with a stout, hairy, glandular stalk. The fruit has 4 rough ribs, and is pale. The plant is 5-9 ft. high, and flowers between July and September, being a herbaceous perennial.
The habitat of this species is waste places, fens, and the plant is rare. The radical leaves are spoon-shaped, blunt, entire. The stem-leaves are stalk-less, thin, lance-shaped, with a narrow point. The flowerheads are bluish-violet and yellow, the ray violet, the disk yellow. The plant is 2-3 ft. high, flowering from August to October, and is a herbaceous perennial.
The habitat of this plant is waste places. The habit is erect. The stem is leafy, branched above, hairy. The leaves are oblong, linear to lance-shaped, fringed with hairs, entire, or with a few teeth. The flowerheads are numerous, small, yellow, panicled or corymbose. The involucre is cylindrical, less than the ray florets, and at length spreading. The phyllaries are slender, green, with membranous border, smooth. The ray florets are slender, sometimes purplish, the disk pale yellow. The ligule is white, hardly longer than the pappus, which is white. The plant is 6 in. to 2 ft. high, flowering from July to September, and is a herbaceous annual.
The habitat of this plant is cultivated fields, roadsides, rough, marshy, stony ground. The habit is erect. The plant is more or less downy. The stem is slender. The branches are opposite. The leaves are short-stalked, ovate, bluntly toothed, fringed with hairs. The flowerheads are yellow in repeatedly forked cymes. The ray florets are few, 4-6, broadly ligulate, white, short. The disk florets are yellow, as long as the phyllaries. The flower-stalks are glandular, without bracts. The involucre is hemispherical. The phyllaries are unequal, oblong, fringed with hairs. The achenes are inversely ovoid, flattened, black. The pappus scales, 8-16, are narrowed to oblong. The plant is 6-24 in. in height, flowering from July to October, and is a herbaceous annual.
The habitat of this plant is waste places. The plant is prostrate below, then ascending, woody. The radical leaves are lance-shaped, clasping, with many soft hairs, which give them a dull appearance. The flowerheads, 1-2, are yellow, on long stalks. The achenes are hairy. The plant is 1-2 ft. high, flowering in July and August, and is a herbaceous perennial.