COMPOSITE. 197 



Bubundulate ; lower ones cordate, ovate, subserrate, petiolate j petioles 



winged. A. diversifolius Mich. 



HAB. Old fields. N. Y. to Car. Sept. U.Stem 23 feet 

 high. Flowers large, in a terminal spike ; ray pale blue ; disk 

 yellow. According to Mr. Elliott A. patens of Willdenow and 

 A. amplexicaulis of Michaux are identical with this species. 



44. A. sagittifolius Wittd. : stem smooth, branched ; leaves oblong- 

 lanceolate, acuminate, sessile, serrate in the middle ; radical ones ob- 

 long, cordate-saggitate, serrate, petiolate ; scales of the involucre 

 loosely imbricate, lanceolate. 



HAB. Rocky woods. N. S. Ton: S. to Car. Sept. y. 

 Stem 2 3 feet high, erect, with many branches. Flowers mid- 

 dle-sized, blue. 



45. A. paniculatus Ait. : stem much branched, smooth j branchlets 

 hairy ; leaves ovate, lanceolate, subserrate, smooth, petiolate ; radical 

 ones ovate-cordate, serrate, scabrous, petiolate ; petioles naked ; invo- 

 lucre loose, somewhat imbricate. 



HAB. Woods. Can. to Car. Aug. Oct. If. Stem 24 feet 

 high. Flowers rather small, but numerous ; rays changing from 

 white to blue ; disk from yellow to purple or brown. Scarcely 

 different from A. undulatus. 



46. A. cordifolius Linn. : stem paniculate, nearly smooth ; leaves 

 cordate, hairy beneath, coarsely serrate, petiolate ; petioles winged j 

 panicle divaricate; involucre loose, slightly imbricate and A. hetero- 

 phyllus Wittd. 



HAB. Mountainous woods. Can* to Flor. Sept. Nov. If. 

 Stem 2 3 feet high, branched, with the branches pubescent. 

 Flowers small, in panicles composed of crowded racemes, white 

 or pale purple. 



47. A. corymbosus Jlit. : stem smooth ; branches hairy ; leaves ovate, 

 sharply serrate, acuminate, nearly smooth ; lower ones cordate, petio- 

 late ; petioles naked ; corymb fastigiate ; involucre oblong, imbricate ; 

 scales obtuse, closely appressed. 



HAB. Dry woods. N. Y. to. Car. July, Aug. 14.. Stem 2 feet 

 high. Flowers larger than in the preceding, in a fastigiate co- 

 rymb, white tinged with purple. 



48. A. macrophyllus Linn. : stem branched, diffuse ; leaves ovate, 

 petiolate, serrate, scabrous ; upper ones cordate-ovate, sessile ; lower 

 ones cordate, petiolate ; petioles somewhat margined ; involucre cylin- 

 drical, closely imbricate ; scales oblong, acute. 



HAB. Rocky woods. Can. to Geor. Sept., Oct. l^.Stem 

 12 feet high. Flowers above middle-size ; rays white or blue. 



*** Pappus double. Flowers generally in corymbs. 



49. JJ. linariifolius Limit. : stem somewhat decumbent ; branches fas- 

 tigiate, 1-flowered ; leaves numerous, linear, mucronate, without 

 aerves or punctures, carinate, scabrous, rigid ; those of the branches 

 recurved ; involucre imbricate, as long as the disk and A. rigidus 

 Wittd. Pursh.Chrysopsis linariifolia Nutt. 



