Coreopsis. COMPOSITE. 385 



Div. 3. CoREOPsiDEiE, DC. Rmjs neutral, Ugulate, or very rarely wanting. Achenia obcompressed, 

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

 hispid upward, but never downward. 



26. COREOPSIS. Linn.: Torr d- Gr A N Am 9 n qqs r„^^^ 



, Auii. (^ i^r. ji. iv. Am. Z. p. 330. TICK-SEED SUNFLOWER 



Coreopsis, Chrtsostemma and Calliopsis, Ijcss., DC. (f-c. 



[ From the Greek, koris, a bug, and op^s, resemblance ; the aehenium having the appearance of some insect.] 



Heads many-flowered ; the rays^bout 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 obeompressed, not 

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

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

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

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

 commonly yellow. Anthers blackish. 



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

 subulate appendage : corolla of the ray and disk yellow. 



1. Coreopsis triciiosperma, Michx. Tick-seed Sunjtoioer. 



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 e.xterior 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 a^Kns. — Michx. Jl. 2. j) 139 • 

 Pursh, Jl. 2. p. 568; Ell. sk. 2. p. 439 ; Bigel. Jl. Bast. p. 315 ; Beck, hot. p. 206 ' DC 

 prodr. 5. p. 372 ; Torr. 4. Gr. Jl. N. Am. 2. p. 310. C. aurca, Lindl. hot. rcg. <.']228 

 not of Ait. ' 



Root biennial. Stem li - 3 feet high, corymboscly paniculate*above. Leaves membrana- 

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

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

 about three-fourths of an inch long. Achenia wiih 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 iho Cupressus ihmjoides occurs ; Long Island. Not 

 found elsewhere in the Stale. August - October. 

 [Floiia.] 49 



