196 COMPOSITE. (COMPOSITE FAMILY.) 



**#**** Leave.! entire, those of the stem sessile, the 6a.se iftcn clasping: heads 

 solitary terminating the branches or somewhat corymbed, large or middle-sized, showy ; 

 .s of the involucre very numerous, ivith loose and spreading or ri curved niosily 

 foliaceous tips, usually mure or less glandular or viscid, as arc the. brtnieldtls, <J-c. 

 - Tnvolttcre imbricated, the scales in several or man if ranks. 



29. A. graiicliflorus, L. Rough with mfiuite hispid hairs; stems slender, 

 loosely much-branched (1 3 high); leaves very small (' !' long), oblong- 

 linear, obtuse, rigid; the uppermost passing into scales of the hemispherical 

 squarrose many-ranked involucre ; rays bright violet (!' long) ; achenia hairy. 

 Dry open places, Virginia and southward. Heads large and very showy. 



30. A. OblOllgifollUS, Nutt. Minutely gla>tdular-pi<bcrulent, much 

 branched above, rigid, paniculate-corymbose (1- 2 high) ; leans narrowly ob- 

 long or lanceolate, mucronate-pointcd, partly clasping, thickish (l'-2'long by 

 2" -5" wide); scales of the involucre broadly linear, oppressed at the base; 

 rays violet-purple; achenia canescent. Banks of rivers, from Pcnn. (Hunting- 

 don County, Porter!) and Virginia to Wisconsin and Kentucky. Flowers not 

 half as large as those of the next. 



A. AMETHYSTINUS, Nutt., of Eastern Massachusetts, is a still wholly obscure 

 species. 



*- +- Involucre of many very slender equal scales appearing like a single row. 



31. A. Novae-Allgliae, L. Stem stout, hairy (3 -8 high), corymbed 

 at the summit; leaves very numerous, lanceolate, entire, acute, auriculate-dasping, 

 clothed with minute pubescence : scales of the involucre lincar-awl-shapcd, loose, glan- 

 dular-viscid, as well as the branchlets ; rays violet-purple, sometimes rose-purple 

 (A. roseus, Dcsf), very numerous; acheuia hairy. Moist grounds ; common. 

 Heads large, corymbed. 



******** Head and imbricated involucre with leafy tips as in the preceding 

 group ; b'jt the foliage as in * * =*. 



32. A. ailtiinalus, Engelm. Somewhat hoary-pubescent ; stems slender 

 (2 -4 high), simple or racemose-branched above; leaves ovate or ovate-lance- 

 olate, pointed, entire or nearly so, the lower cordate and long-petioled, the upper 

 small and almost sessile; scales of the hemispherical involucre imbricated in 

 several rows, apprcsscd, with linear spreading leafy tips ; achenia smooth. 

 Limestone cliffs, W. Illinois (and Missouri), Engelmann. Heads as large as 

 those of No. 30 : rays violet-purple. 



$ 4. ORITR6PHIUM, Kunth. Scales of the involucre narrow, nearly equal and 

 almost in a single row, more or less herbaceous: pappus of soft and uniform capil- 

 lary bristles : mostly loir perennials, bearing solitary orfeiv //tads. 



33. A. tfi'Ulliillifolius, Pursh. Slightly pubescent, slender (6' -12' 

 high) ; Iea\v> very numerous, narrowly linear; branches prolonged into slender 

 naked peduncles, bearing solitary small heads; rays rose-purple or whitish. 

 New Hampshire, about the White Mountains (Mr. Eddy in herb. Tucker man), 

 L. Superior, and northward. 



$5. ORTIIOMKRIS, Torr. & Gr. Scales of the invohtrre regularly imbricated, 

 t', <>/'/, a i;irin<i1<-, mt/i munbranaceous margins, enlinly d<'atitute. of herbaceous 

 tips : pajipus of sojl and \jntqual capillary bristles. 



