COMPOSITE. ~ 123- 



A. tardiflo'rus, L. Eays pale violet. Stem glabrous 

 oi nearly so, 1-2 feet high. Leaves lanceolate or oblong- 

 lanceolate, acuminate, with tapering and somewhat auricled 

 base.j Heads few, as a rule. Involucre loose, the outer 

 soale^ leaf-like. — Atl. Prov. 



*** None of the leaves heart -slia^yed ; thoseofthe stem sessile, tapering 

 at the base {except in No. 11 J. 



12. A. rad'Ula, Ait. Bays light violet. Radical leaves 

 all tapering into margined petioles. Stem-leaves sessile, 

 oblong-lanceolate, pointed, sharply serrate in the middle, 

 very rough both sides, rugose. Scales of the bell-shaped 

 involucre oblong, appressed, with slightly spreading herb- 

 aceous tips. — Low grounds, Atl. Prov. 



13. A. ericoi'des, Ait. Bays white or nearly so. Stem 

 smooth or nearly soj 1-3 feet high, the branchlets or ped- 

 uncles racemose on the upper side of the spreading branches. 

 Lowest leaves oblong-spathulate, the others linear-lance- , 

 olate or linear-awl-shaped. — Barren soil, and margins of. 

 lakes and rivers. Var. viUosus, Torr. and Gray, has hairy 

 stems and leaves, 



14. A. multiflo'rus. Ait. Bays white, 10-20. Stem pale 

 or hoary with minute pubescence, 1 foot high, bushy. 

 Leaves crowded, linear, with rough margins ; the upper 

 partly clasping. Heads small, crowded on the racemose 

 branches. Scales of the involucre with spreading green 

 tips. — Dry soil. 



15. A. Tradesean'ti, L. (A.tenuifoUus.) Bays white or 

 purplish. Scales of the involucre narrowly linear, in 3 or 4 

 rows. Heads small, very numerous, in 1-sidod close racemes 

 on the branches. Stem 2—4 feet high, much branched, 

 smooth. Leaves linear-lanceolate, with long slender point, 

 the larger ones with a, few remote teeth in the middle.^Low 

 grounds. 



16. A. diffu'SUS, Ait. [A. miser, L.) "^ays pale blue or 

 whitish. Involucre nearly as in No. 15. Stem more or less 

 pubescent, much branched. Heads small, in loose 1-sided 



