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 railway banks, fields, ballast-heaps, waste places, and cultivated ground. The habit is erect. The stems are much-branched, cottony. The leaves are 2-pinnatifid, downy below, the segments parallel, decurrent, coarsely toothed. The flowerheads are bright yellow, without a ray sometimes, hemispherical, on long stalks, terminal The scales do not project. The achenes are square in section, crowned with a membranous border, undivided. The plant is 6-24 in. high, flowering in July and August, and is a herbaceous perennial or biennial.
The habitat of this species is waste places. The plant is of low stature. The stem is densely leafy. The foliage is like that of M. inodora. The flowerheads are greenish-yellow, rayless, on short stalks. The phyllaries are broadly membranous. The plant is 4-12 in. high, flowering from June to August, and is a herbaceous annual.
The habitat of this plant is waste places. The leaves are succulent, lance-shaped, clasping, with acute lobes. The flowerheads are brilliant-yellow, button-shaped, without any ray florets, and small, solitary. The plant is 4-12 in. in height, flowering in July and August, and is a herbaceous perennial.
The habitat of this plant is shrubberies and cliffs at Tenby, borders of plantations, and waste places. The leaves are heart-shaped, green, downy below. The flowerheads are yellow, the female florets shortly ligulate. The flowers have the odour of vanilla. The plant is 6-12 in. high, flowering from March to May, and is a herbaceous perennial.
The habitat of this plant is damp stony hollows, waste places, plantations. The leaves are not so large as in the last, heart-shaped, deeply scalloped, very white beneath. The flowerheads are white or cream colour. The plant is 6-12 in. high, flowering from March to May, and is a herbaceous perennial.
The habitat of this plant is waste dry ground, shingle, sandhills. The plant is foetid, glandular, and clammy. The habit is erect. The stem is stout, much-branched, spreading, rigid, grooved, angled, wavy, the segments oblong, unequally toothed and lobed. The leaves are broad, more or less bi-pinnatifid. The flowerheads are yellow, in irregular corymbs, bell-shaped, on long stalks, and are few, erect, broad. The involucre is clammy, cylindrical. The ray florets are small, turned down. The outer phyllaries are few, green, hall as long as the inner, and hairy. The achenes are hairless, slender, ribbed. The plant is 6-24 in. high, flowering from July to September, and is a herbaceous annual.
Senecio Cineraria, D.C. - This plant is found to hybridize with 5. Jacoba in Ireland. The stem is woody. The whole plant is white and tomen-tose. The leaves are densely white-felted below, and deeply divided nearly to the base. The segments are broader and lobed at the ends. The flowerheads are yellow, numerous. The plant is 1-2 ft. high, flowering from July to September, and is a herbaceous perennial.