144 SYNGENeSIA. superflua. 



white tomentum, segments trifid, linear, almost filiform 

 and acun^inate. Receptacle villous. Hab. On the sum* 

 mits of the highest gravelly hills of the Missouri; com- 

 mencrng to appear about Plum creek. Scent and bitter- 

 ness similar to that of A. Abronatum. 



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- 

 trod uced from Spain? 11. annua? Hab. On the island 

 of Michilimakinak in Lake Huron. A smaller plant than 

 ihe preceding which it greatly resembles, but is annual. 



12. canadensis. Stem lierbaceous and paniculate, most- 

 ly erect; radical leaves subpseudopinnate, somewhat deci- 

 duously tomentose, cauline pseudopinnate, segments sub- 

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

 glomerate and sessile; calix subglobose, scales oval, sca- 

 i-iose: flosculi numerous. Hab. Abundant on all the san- 

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

 gan and Superior; also on the hills of the Missouri, around 

 the Mandon towns to the Mountains? A. campestiis. Ph. 

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

 campestris, but the flower is much larger, hemispherical 

 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 high, smooth and mostly 

 brown; lower and radical leaves covered with a slender, 

 cotton-like tomentum, unequally spread; upper leaves 

 nearly smooth. 



13. caudata. 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. 1 have never seen this plant 

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

 lieve Michaux's habitat 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. xmlgaris. The American plant, from imperfect spe- 

 cimens in my possession, will I believe prove a very dis- 

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

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

 covered with impressed punctures. Th»s plant which 

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

 in various pans of North Carolma, in the most sequestered 

 forests. 15. spitham<-*a. Ph. la Labrador. 



