'COMPOSITE. 201 



is still retained under the latter genus by Dr. Richardson, (App. 

 to Frank. Jour.) and by Dr. Torrey, in his account of plants col- 

 lected during a journey to the Rocky Mountains by Dr. E. 

 James. I have changed the specific name, as that of hetero 

 phyllus had been long since applied to another Senecio from the 

 Cape of Good Hope. 



** Florets tubular : those of the ray wanting. 



6. & vulgaris Linn. : leaves mostly clasping, pinnatifid, toothed ; 

 flowers in crowded corymbs. 



HAS. Cultivated grounds. N. S. May Oct. H^Stem 18 

 inches high. Floicers yellow. Introduced. Groundsel. 



7. S. Meracifolius Linn. : stem virgate, paniculate ; leaves clasping, 

 oblong, acute, unequally, acutely and deeply toothed ; involucre 

 smooth ; seeds pubescent. 



HAB. Road sides, &c. Can. to Car. July, Aug. 0. Stem 

 2 6 feet high, succulent, branching towards the summit, fle- 

 ers -in a compound terminal panicle, white. Fire Weed. 



8. S. elongatus Pursh: smooth ; radical leaves spathulate, serrate, 

 attenuated into a petiole ; cauline ones pinnatifid, toothed, very re- 

 mote ; peduncles elongated, umbelled, corymbed. 



HAB. Rocks on banks of streams. Penn. July, Aug. !. 

 Resembles S. balsamitce, but is destitute of ray florets. 



SUBORDER VI. HELIANTHEjE. 

 35. HELENIUM. Linn. 



Involucre simple, many parted. Rays deeply 3-eleft. Pap- 

 pus chaffy ; chaff 5-awned. Receptacle globose, naked, 

 chaffy on the margin. Acines villous. 



Syngenesia. Superflua. 



H. autumnale Linn. : leaves lanceolate, serrate, decurrent ; flowers in 

 corymbs ; florets of the disk 5-cleft ; of the ray flat, reflexed. 



HAB. Low grounds. Can. to Car. W. to Miss. Sept., Oct. 

 2_(. Stem 2 3 feet high, winged by the decurrent leaves. Flow- 

 ers in small corymbs, yellow. "Whole plant intensely bitter. 



American Sneczewort. 



36. HELIANTHUS. Linn. 



Involucre imhricate, generally squarrose, leafy. Receptacle 

 chaffy, flat. Pappus 2-leaved, caducous. 



Syngenesia. Frustranea. 



* Florets of disk dark purple. 



1. H. atrorulens Linn. : hispid ; stem naked towards the summit, 

 loosely paniculate ; leaves opposite, spathulate, oblong-ovate, crenate, 

 3-nerved, scabrous on the upper side ; scales of the involucre ovate- 

 lanceolate, as long as the disk. 



