144 SYNGEXESIA. SUrERFLL'A. 



white tomentum, segments trifid, linear, almost filiform 

 and acuminate. Receptacle villous. Hab. On the sum- 

 j-nirs of the Jjighest ^^ravelly hills of the Missouri: com- 

 mencing- to appear about Plum creek. Scent and bitter- 

 ness similar to that of A. Ahronutvm. 



10. biennis. Abundant in the suburbs of St. Louis and 

 St. Charles, on the Missouri, but does not continue any 

 considerable distance up that river. Has it not been in- 

 troduced from Spain? 11. annua? 11 a b. On the island 

 of Michilimakinak in Lake Huron. A smaller plant than 

 the preceding which it greatly resembles, but is annual. 



12 canadensis. Stem herbaceous and paniculate, most- 

 ly erect; radical leaves subpseudopinnate, somewhat deci- 

 duously tomentose, cauline pseudopinnate, seg-ments sub- 

 setaceous, incise, flat, and nearly smooih; flowers partly 

 g'lomerate and sessile; calix subg-lobose, scales oval, sca- 

 riose; flosculi numerous. Hab. Abundant on all the san- 

 dy shores of the St. Laurence, lakes Erie, Huron, Michi- 

 g-an and Superior; also on the hills of the Missouri, around 

 the Mandon towns to the Mountains? -3. campestris. Ph. 

 Fl. Am. p. 522- It possesses considerable affinity to Ji. 

 campestris, but the flower is much larger, heuiispherical 

 and sessile, with scariose scales, it is also a much larger 

 plant. Obs. Stem sometimes decumbent at the base, 

 commonly erect, 3 or 4 feet hig-h, smooth and mostly 

 brown; lower and radici*! leaves covered with a slender 

 cotton-like tomentum, unequally spread; upper leaves 

 nearly smooth. 



13. caiidata. Stem simple and herbaceous, densely and 

 pyramidally paniculate; radical and lower cauline leaves 

 pseudobipinnate pubescent; upper pseudopinnate, seg- 

 segments subsetaceous, alternate, divaricate, somewhat 

 convex; flowers pedicellate, erect, globose-ovate. Hab. 

 On the islands of Egg harbour, N. Jersey, and in the bar- 

 ren woods of North Carolina. I have never seen this plant 

 near the Missouri nor in any part of Louisiana, and be- 

 lieve Michaux's habitut to be erroneous. It is very near- 

 ly allied to A. canadensis; variable in magnitude; in Caro- 

 lina I found it 6 feet high; on the strand of New Jersey 

 scarcely 2 feet. 



14. vidguris. The American plant, from imperfect spe- 

 cimens m my possessi .n, will I believe prove a very dis- 

 tinct species; — the lobes of the leaves are obtuse; on the 

 uruler side, very densely tomentose, and white, above also 

 covered with impressed punctures. Th s nlant which 

 may not be that of Michaux, I observed without flowers, 

 in various pan s of North (^arolina, in th<^ most sequestered 

 forests. 15. spitham<xa. Ph. In Labrador. 



