Coreopsis. COMPOSITiE. 385 



Div. 3. CoREOPsiDE^, DC. Rays neutral, ligulate, or very rarely wanting. Achenia obcompressed, 

 not beaked. Pappus 2- (or rarely 4-) toothed or atoned, or none ; the awns or teeth often 

 hispid upward, but never downward. 



26. COREOPSIS. Linn. ; Torr. 4- Gr. fl. N. Am. 2. p. 338. TICK-SEED sunflower. 



Coreopsis, Cbrtsostemma and Calliofsis, Less., DC. 4-c. 



[ From the Greek, koris, a bug, and opsis, resemblance ; the achenium having the appearance of some insect.] 



Heads many-flowered ; the rays about 8 (rarely wanting), neutral ; disk-flowers perfect, with 

 a slender tube and campanulate 5-toothed limb. Involucre double, each of about 8 scales ; 

 the exterior foliaceous, narrowed, usually more or less spreading ; the interior broader and 

 often rather membranaceous, mostly deciduous with the fruit. Achenia obcompressed, not 

 rostrate or tapering at the summit, often winged, 2-awned, 2-toothed or with 2 minute scales, 

 sometimes naked at the summit ; the teeth or awns usually hispid upwards, but never 

 downwards. — Herbaceous plants, with opposite or sometimes alternate leaves which are 

 very often ternately or pinnately divided. Heads terminal, solitary or corymbose. Rays 

 commonly yellow. Anthers blackish. 



§ 1. EtJCOREOPSis, Torr. &. Gr. Branches of the style terminated by an acute cone, or an abrupt 

 subulate appendage : corolla of the ray and disk yellow. 



I. Coreopsis trichosperma, Michx. Tick-seed Sunflower. 



Smooth ; stem obscurely 4-angled ; leaves opposite, on short petioles, pinnately 5-7- 

 parted ; the divisions linear-lanceolate, serrated or incised, the uppermost leaves often 3-5- 

 cleft and nearly sessile ; heads paniculately corymbed ; scales of the exterior involucre about 

 the length of the interior, linear or spatulate, slightly ciliate ; achenia cuneiform-oblong, hispid 

 above, crowned with 2 triangular hispid teeth or short stout awns. — Michx. fi. 2. p. 139 ; 

 Fursh, fl. 2. p. 568 ; Ell. sk. 2. p. 439 ; Bigel. fl. Bost. p. 315 ; Beck, hot. p. 206 ; DC. 

 prodr. 5. p. 372 ; Torr. ^ Gr. fl. N. Am. 2. p. 340. C. aurea, Lindl. bat. reg. t. 1228, 

 not of Ait. 



Root biennial. Stem 1^-3 feet high, corymbosely paniculate above. Leaves membrana- 

 ceous, 3-6 inches long ; the divisions 2-4 lines wide, with very acute and somewhat distant 

 serratures. Heads on long slender peduncles. Rays bright yellow, oblong, obtuse, entire, 

 about three-fourths of an inch long. Achenia with a prominent ridge on each side, usually 

 crowned with triangular acute teeth, which are sometimes produced into very short awns. 



Swamps, particularly those in which the Cupressus thuyoides occurs ; Long Island. Not 

 found elsewhere in the State. August - October. 

 [Flora.] 49 



