COMPOSITAE 633 



Leaves deeply pinnatifid, the segments mostly 



incised. 6. A. vulgaris. 



Leaves finely dissected into short linear lobes. 7. A. Pontica. 



1. A. caudata Michx. In dry sandy soil, abundant on sea 



beaches: Que. to Fla., Man., Neb. and Tex. 



In our area practically confined to the sea beaches of L. I., 

 and the coastal plain of N. J., but not in the pine-barrens. 



2. A. Absinthium L. In waste places: Newf. and Hudson Bay 



to Mass., western Ont., Mont, and N. Car. Native of 

 Europe. 



Rare as an escape from gardens in our area, often locally wanting. 



3. A. annua L. In waste places: Ont. to D. C, Tenn., Ark. and 



Kan. 



Rare as a weed in parts of our range, often wanting locally. 



4. A. biennis Willd. Native in the N. \V. Terr, and northwestern 



U. S., now widely distributed as a weed from Man. to N. S., 

 south to Kan., Ky. and Pa. 



More common than the preceding in our area, always as a weed. 



5. A. Stelleriana Bess. Sandy beaches: Me. and Mass. to N. J. 



Also in northeastern Asia. 



Common along all our sea beaches, apparently, though perhaps 

 not actually native with us. 



6. A. vulgaris L. In waste places: N. S. to Ont., Mich., N. Car. 



and Pa. Native of Europe and Asia. 

 Locally abundant as a weed, often wanting. 



7. A. Pontica L. On ballast: eastern U. S., Native of Europe. 



Rare as a weed in parts of our area, except the pine-barrens. 



The following have all been collected as waifs near the larger cities: Artemisia Abro- 

 tanumL., A . gnaphalodes Nutt., A. campestrisL., A. laciniata Willd., A.frigida Willd. 

 and the Tarragon, Artemisia Dracuncttlus L. 



Tribe 8. Senecioneae 



Leaves all basal; heads on scapes. 



Heads solitary; flowers yellow. 45. Tussilago. 



Heads corymbed; flowers white or purple. 46. Petasites. 



Leaves alternate. 



Flowers white, whitish or pinkish; rays none. 



Marginal flowers pistillate; disk-flowers perfect. 47. Erechtites. 



Flowers all perfect. 



