338 COMPOSlTiE. Agarista. 



the habit of Coreopsis. Leaves ahernate, pinnately and bipinnately parted ; 

 the rachis and segments linear. Heads showy, solitary, terminating the 

 terete and naked summit of the stem or branches. Flowers of the (large) 

 ray and of the disk golden yellow. 



A. calliopsidea (DC. ! 1. c.) — Hook. Sf Am. ! hot. Beechey, suppl. p. 352. 



California, Douglas! — A very pretty plant, a foot or more in height; the 

 bright golden rays about 8 lines long, crenulate at the summit. The chaflf 

 which subtends each fertile flower is confluent at the base with the obtuse 

 callus of the achenium, and therefore necessarily deciduous with it : the ex- 

 terior surface of the latter, which is covered with the chaff, is perfectly gla- 

 brous. The twosquamellae of the pappus are longer than the achenium, and 

 are minutely striate, and obscurely denticulate, with a rigid axis, much in 

 the manner of Palafoxia &c. ; so that in this respect it accords with Hele- 

 nieas ; but its affinities are with Coreopsis, in which the section Leachia has 

 a similar although much smaller pappus. 



101. COREOPSIS. Linn. gen. no. 981 (excl. spec.) ; Schkuhr, handb. t. 260. 



Coreopsis, Chrysostemma, & Calliopsis, Less., DC. (f*. 



Heads many-flowered ; the ray-flowers about 8 (wanting in one or two spe- 

 cies), neutral ; those of the disk tubular, perfect. Involucre double, each of 

 about 8 (6-12) scales ; the exterior foliaceous, narrower and sometimes more 

 numerous, usually more or less spreading ; the interior broader and often 

 rather membranaceous. Receptacle flat or somewhat convex, chaffy; the 

 chaff membranaceous, mostly deciduous with the fruit. Corolla of the disk 

 with a slender tube, and an infundibuliform or campanulate 5-toothed limb. 

 Branches of the style hairy at the summit, and terminated witli an acute con- 

 ical or subulate appendage, or truncate, or obtuse. Achenia obcompressed, 

 not rostrate or tapering at the summit, often winged, 2-awned, 2-toothed, or 

 somewhat 2-squamellate, or sometimes naked at the summit; the teeth or 

 awns usually denticulate or hispid upwardly, but never downwardly. — Her- 

 baceous (American) plants, with opposite or sometimes alternate divided or 

 undivided leaves. Heads terminating the branches, solitary or corymbose. 

 Rays (many-nerved) usually yellow: the corolla of the disk yellow or dark 

 purple at the summit. Anthers blackish. 



§ 1. Branches ofOie style terminated by an acute cone, or an abrupt subulate 

 appendage : corolla of the ray and disk {with one or tico exceptions) yellow. 



EUCOREOPSIS. 



* Achenia wingless, auieate-ollong, 1-ridged on each side, Twt incurved, 2- (rarely some- 

 what 3-4-) toothed or awned: chaff deciduous vnth the fruit: scales of the exterior in- 

 volucre distinct, foliaceous, often numerous and irregular, reflexed : rays (rarely want- 

 ing') ohova.te-oblong, obtuse, entire or nearly so : leaves opposite, petioled, mostly ter- 

 nately or pinnately divided or lobed ; the segments sen'ate, very veiny in the manner 

 of Bidens ; the primary veins often running to the sinuses. — Diodonta, Nutt. 



These plants entirely accord with Bidens § Platycarpcea, except that the awns or 

 teeth of the achenia are not retrorsely barbed, and are often nearly wanting. We do 



