This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
(Greek, gaping ray: the marginal corollas often ray-like). Composite. West American low herbs or undershrubs sometimes planted in the open for ornament.
Leaves alternate and mostly dissected: flowers yellow, white or flesh-colored on solitary peduncles or in loose cymes; florets of one kind, but the marginal ones with a more or less enlarged limb; involucre campanulate; receptacle flat and generally naked: pappus of toothed or entire scales (wanting in one species). - About 20 species, of which 3 have been introduced as border plants; but they are little known to gardeners. Of easy cultivation Prop, by seeds or division.
A. Pappus of entire or nearly entire persistent scales.
Nutt. Small, tufted annual, white-pubescent when young but becoming nearly or quite glabrous: 1 ft.: leaves once or twice pinnately parted, the lobes linear or filiform: heads 1/3in. high, lemon-yellow.
Douglasii, Hook. & Arn. Perennial, 3-15 in. high, usually white-woolly when young: leaves broad, bipin-nately parted into short and crowded, obtuse lobes: heads 1/2-3/4in. high, white or whitish, usually in crowded, cymose clusters. Mont, south and west. - Variable. variety achilleaefolia, A. Nelson, is often sold for the type. It has more finely divided leaves
AA. Pappus of fimbriate and deciduous scales, or even wanting.
Gray. Tufted annual, 1-2 ft., rusty pubescent and somewhat sticky on the under side of the leaves, glandular hairy above: leaves twice or thrice pinnately parted into short-linear or oblong lobes: heads 1/2in. high, the involucre viscid, the florets white or cream-color. S. Calif. n. Taylor.†