obcompressed

Achenes only in the ray, obcompressed, surrounded by a slender callous margin, crowned with the persistent ray-corolla and a pappus of 2 small chaffy scales.—Leaves alternate.

Achenes obcompressed, ribbed or striate, not beaked; pappus copious, of very white exceedingly soft and fine bristles mainly falling together.—Leafy-stemmed coarse weeds, chiefly smooth and glaucous, with corymbed or umbellate heads of yellow flowers; produced in summer and autumn.

Achenes all in the ray, obovate, obcompressed, 4-angled, each one partly enclosed by the short scale of the involucre behind it; pappus a small chaffy crown, 2–3-toothed, and wanting on the inner side.—A hairy, perennial herb, with opposite long-petioled leaves, and solitary long-peduncled heads of yellow flowers, nearly stemless when it begins to flower, the flowerless shoots forming runners.