80 COMPOSITAE. 



date and wing-petioled, the upper linear or lanceolate, sessile; heads race- 

 mose, scales loose, linear-subulate. Woods; common; Fayette, Delaware, and 

 Johnson counties; reported from Winneshiek, Allamakee, Clayton, Dubuque, 

 Des Moines, Henry, Plymouth, and Monona counties. 



A. drummondii Lindl. Stem stout, 2-4 feet high, pale, grayish pubescent; 

 leaves ovate or ovate-lanceolate, acuminate, rough above, canescent beneath 

 the lower and basal cordate, with slender naked petioles, the upper with cor- 

 date or rounded bases and margir ed petioles, those of the branches sessile. 

 Dry soil, open woods; infrequent; Winneshiek, Delaware, Muscatine, Henry, 

 Des Moines, Johnson, Jasper, Winnebago and Dickinson counties, reported 

 from Story and Floyd counties. 



** Leaves not cordate or petloled, some or all of the caullne iilth ard-ite.or 



auriculute clasping: base?. 



f Stem rough, or hvrsute-puhesccnt. 



X Leai es entire, oblong, linear, or lanceolate. 



$ Leaves sessile, strongly cordate-clasping. 



A. patens Ait. Stem 2-4 feet high, rough-pubescent, loosely paniculate 

 above; leaves ovate-oblong to oblong-lanceolate, cordate-clasping; heads 

 large, terminal; rays many, violet-blue; scales slender, tips acute, spreading. 

 Forms from Delaware county have been referred to this species. 



A. phlcgifolius Mnhl. Stem 2-4 feet high, rough-pubescent; leaves lan- 

 ceolate to oblong-lanceolate, entire, acuminate, auriculate-clasping, much 

 contracted below the middle, thin, rough above, pubescent beneath; rays 

 many, purple blue. Woods; Winnebago county. (.4. patens var. phlogifollus 

 Nees.) 



A. novae-ongliae D. Stem 3-7 feet high, stout, hairy, leafy, corymbosely 

 branched; leaves lanceolate, auriculate-clasping, entire, acute; rays many, 

 violet-purple, rarely varying to rose-purple, or white; scales nearly equal, 

 green throughout, narrowly linear. Sloughs and low places; common; Win- 

 neshiek, Floyd, Delaware. Johnson, Jefferson, Des Moines, Appanoose. De- 

 catur, Story, Winnebago, Lyon, and Emmet counties; reported from Fayette 

 and Monona counties. 



$ § Leaves slightly cordate clasping. 



A. oblongifolius Nutt. Stem 1-2 feet high, much branched, hirsute-pu- 

 bescent, leafy; leaves narrowly oblong to oblong-lanceolate, entire, clasping', 

 rough or hispidulous on both sides, rough-margined; rays violet purple; invo- 

 lucre hemispheric, the bracts glandular. Prairies and rocky bluffs; infre- 

 quent; Fayette, Muscatine, Des Moines, Johnson, Pottawattam 5 Calhoun, 

 and L3 T on counties; reported from Story, Monona, and Woodbury counties. 



A. amethystinus Nutt. Eesembles the preceding, stem taller, 2-.i feet 

 high, hoary puberulent or somewhat hirsute; leaves linear-lanceolate, rough 

 on both sides, partly clasping; involueral scales erect, the green tips merely 

 spreading, involucre turbinate, the bracts hispid. Moist places, scarce; re- 

 ported from Floyd and Story counties. 



X X 'Lhe lower and most of the upper leaves serrate. 



A. puniceus L. Stem stout, 3-G feet high, hispid; leaves oblong-lanceo- 

 late, auriculate-clasping, acuminate, coarsely serrate to sparingly denticulate 

 or sometimes entire; heads rather large, sparsely paniculate or tliyrsoid- 

 erowded; involucre of loose, thin, equal, linear scales, arranged in two rows; 

 rays % inch long, showy, violet, varying to purple or white. Swampy 

 grounds: frequent; Fayette, and Muscatine counties, reported from Story 

 county. 



