COMPOSITE. (COMPOSITE FAMILY.) 221 



7. C. delphiiiifolia, Lam. Glabrous or nearly so ; leaves divided in- 

 to 3 sessile leaflets which are 2 - ^-parted, their divisions lance-linear (1" - 3" broad), 

 rather rigid ; disk brownish. Pine woods, Virginia and southward. July. 



8. C. verticil lata, L. Glabrous ; leaves divided into 3 sessile leaflets 

 which are 1 - 2-pinnately parted into narrowly linear or filiform divisions. Damp 

 soil, from Maryland and Michigan southward. Also in gardens. July -Sept. 



9. C. paliiiiita, Nutt. Nearly smooth, simple ; leaves broadly wedge- 

 shaped, deeply 3-cleft, rigid ; the lobes broadly linear, entire, or the middle one 3- 

 lobed. Prairies, Michigan to Wisconsin, and southwestward. July. 



# * * # Achenia nearly orbicular, broadly winged, incurved, furnished with a callous 

 tubercle on the inside at the top and bottom, crowned with 2 small chaff-like denticU' 

 late teeth : outer involucre about the length of the inner : rays large, coarsely 3-5- 

 toothed: leaves opposite or the uppermost alternate: heads on long naked peduncles. 



10. C. auric ulata, Linn. Pubescent or glabrous; stems l-4high, 

 branching, sometimes with runners ; leaves mostly petioled, the upper oblong or oval- 

 lanceolate, entire ; the lower oval or roundish, some of them variously 3 - 5-lobed or 

 divided ; scales of the outer involucre oblong-linear or lanceolate, ty Rich 

 woods and banks, Virginia, Kentucky, and southward. June - Sept. 



11. C. laiiceolata, L. Smooth or hairy (l-2high); stems short, 

 tufted, branched only at the base ; leaves all entire, lanceolate, sessile, the lowest 

 oblanceolate or spatulate, tapering into petioles ; scales of the outer involucre 

 ovate-lanceolate. Ij. Kich or damp soil, Michigan to Virginia, Kentucky, 

 and southward. July. Also cultivated. Heads showy : rays 1' long. 



2. Branches of the style truncate : rays rose-color : disk yellow. 



12. C. rosea, Nutt. (ROSE-FLOWERED COREOPSIS.) Stem branching, 

 lafy, smooth (6' -20' high) ; leaves opposite, linear, entire; heads small, some- 

 what corymbed, on short peduncles ; outer involucre very short ; rays 3-toothed ; 

 achenia oblong, wingless ; pappus an obscure crown-like border. IJ. Sandy 

 and grassy swamps, Plymouth, Massachusetts, to New Jersey, and southward : 

 rare. Aug. 



C. TINCT6RIA, Nutt., a native of the plains beyond the Mississippi, with 

 the rays yellow above, and brown-purple towards the base, is now everywhere 

 common in gardens. 



42. B I DENS, L. BUR-MARIGOLD. 



Heads many-flowered ; the rays when present 3-8, neutral. Involucre dou- 

 ble, the outer commonly large and foliaceous. Receptacle flattish, the chaff 

 deciduous with the fruit. Achenia flattened parallel with the scales of the invo- 

 lucre, or slender and 4-sided, crowned with 2 or more rigid and persistent awns 

 which are downwardly barbed. Annual or perennial herbs, with opposite van 

 ous leaves, and mostly yellow flowers. (Latin bidens, two-toothed.) 

 * Achenia flat, not tapering at the summit. (All annuals' 1 .) 



\. B. frond osa, L. (COMMON BEGGAR-TICKS.) Smooth or rather 

 hairy, tall (2 -6 high) and branching; leaves 3-5-divided; the leaflets lanceo- 

 19* 



