Heads many-flowered; rays neutral, few or none. Involucral scales few, herbaceous, nearly equal, soon deflexed beneath the globular disk. Receptacle small, chaffy. Achenes flat, obovate, winged or wingless, at maturity spreading in all directions; pappus of 2 or 3 smooth persistent awns.--Tall branching perennials, with serrate feather-veined leaves, tapering to the base and mostly decurrent on the stem. Heads corymbed; flowers chiefly yellow. (Name from ἀκτίς, _a ray_, and μερίς, _a part_; alluding to the irregularity of the rays.) 1. A. squarròsa, Nutt. Stem somewhat hairy, usually winged above (4--8° high); leaves alternate or the lower opposite, oblong or ovate-lanceolate, pointed at both ends; rays 2--8, irregular.--Rich soil, Penn. and W. New York to Iowa, and southward. Sept. 55. COREÓPSIS, L. TICKSEED. Heads many-flowered, radiate; rays mostly 8, neutral, rarely wanting. Involucre double; each of about 8 scales, the outer rather foliaceous and somewhat spreading; the inner broader and appressed, nearly membranaceous. Receptacle flat, with membranaceous chaff deciduous with the fruit. Achenes flat, obcompressed (i.e., parallel with the scales of the involucre), often winged, not narrowed at the top, 2-toothed or 2-awned, or sometimes naked at the summit, the awns not barbed downwardly.--Herbs, generally with opposite leaves, and yellow or party-colored, rarely purple, rays. (Name from κόρις, _a bug_, and ὄψις, _resemblance_; from the form of the achene.) § 1. _Style-tips truncate or nearly so; outer involucre small and short; rays rose-color or yellow with brown base; pappus an obscure border or none._ 1. C. ròsea, Nutt. Perennial; stem branching, leafy, smooth (6--20´ high); leaves linear, entire; heads small, somewhat corymbed, on short peduncles; rays rose-color, 3-toothed; achenes oblong, wingless.--Sandy grassy swamps, Plymouth, Mass., to N. J., and southward; rare. Aug. 2. C. cardaminefòlia, Torr. & Gray. Annual, 6´--2° high; leaves 1--2-pinnately divided, the lobes oval to lanceolate or above linear; rays yellow with brown-purple base; achenes short, smooth or papillose, winged.--Kan. to La. and Tex. 3. C. tinctòria, Nutt. Annual, glabrous, 2--3° high; leaves 1--2-pinnately divided, the lobes lanceolate to linear; achenes oblong, wingless; rays yellow with more or less of crimson-brown.--Minn. to Tex., etc.; common in cultivation. § 2. _Style-tips abruptly cuspidate, hispid; involucres nearly equal; achenes roundish, winged, incurved, often papillose and with a callus inside at base and apex; pappus 2 small teeth or none; ray mostly yellow and palmately lobed; perennials, with long-pedunculate heads; lower leaves petiolate._