

I 



COMPOSITE. (COMPOSITE FAMILY.) 221 



7. C. <lelf>liiiii folia, Lam. Glabrous or nearly so; leaves divided in- 

 to 3 sessile leaflets which are 2 - 5-parted, their divisions lance-linear ( 1 " 3" broad), 

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



8. C. VCl'ticilista, L. Glabrous ; leaves divided into 3 sessile lea/lets 

 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. pailimta, 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 south westward. July. 



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

 tubei'de on the inside at the top and bottom, crowned with 2 small chajf-Uke denticu- 

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

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



10. C. auriClllata, Linn. Pubescent or glabrous; stems l-4higli, 

 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. laaiccol-ata, L. Smooth or nalry (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. 1\. Rich or damp soil, Michigan to Virginia, Illinois, 

 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, 

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

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

 achenia oblong, wingless; pappus an obscure crown-like border. 1J. 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. BIDENS, L. BUR-MARIGOLD. 



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

 ble, the outer commonly large and foliaccous. 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 vari 

 ous leaves, and mostly yellow flcwers. (Latin bidcns, two-toothed.) 

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



]. 15. froiitlosa, L. (COMMON BEGGAR-TIOKS.) Smooth or rather 

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

 19* 



