COMPOSITE. (composite FAMILY.) 203 



the others sessile or partly clasping ; the uppemiost very small, erect ; scales of 

 the involucre in 3 -4 rows, linear, acute. — Dry pine harrens, Florida and Geor- 

 gia. — Stem l°-2° high. Lowest leaves 1' long, the upper ones 2" -3" long, 

 similar to those of No. 13. 



29. A. dumosus, L. Smoothish ; stem slender, racemose-panicled, bear- 

 ing the small heads chiefly on slender and very leafy branchlcts ; leaves linear, 

 entire, spreading or refle.\ed ; the lowest spatulate-lanceolate, serrate ; those of 

 the branches short, linear-oblong, and mostly obtuse : scales of the involucre 

 closely imbricated in 3-6 rows, with obtuse green tips. (A. foliolosus, Ell.) — 

 Dry or damp soil, common, and running into several varieties. — Stem 2*^-3° 

 high. Eays pale purple or white. 



30. A. Tradescanti, L. Stem slender, pubescent, racemosc-branclicd ; 

 leaves long, lincar-lanccolate, sparingly sen-ate, tapering into a long and slender 

 point ; the uppermost entire ; heads in close racemes along the spreading branch- 

 es ; scales of the involucre narrow-linear, acute, imbricated in 3 - 4 rows. — Var. 

 FRAGiLis. Leaves mostly entire ; heads fewer, often solitary on the branchlets. 

 (A. tenuifolius, Ell.) — Low ground in the upper districts. — Stem 2° - 3° high. 

 Rays pale purple or wJiitc. 



31. A. miser, L. Pubescent or hairy; stem simple, and bearing the small 

 heads in a long and leafy compound raceme, or diffusely branched, with the 

 heads scattered along the branches, or in short few-flowered racemes ; leaves 

 varying from linear-lanceolate to wedge-obovate, acute at each end, sluirply ser- 

 rate in the middle ; the lowest spatulate, the uppermost entire ; scales of the 

 involucre linear, acute. — Low grounds and banl^s, common and very variable. 

 — Stem l°-4° long. Rays white or purplish. A. diffusus, A. divcrgens, and 

 A. pendulus, of Aiton, are forms of this. 



-t- -1- Heads middle-sized. 



32. A. simplex, Willd. Stem smooth or pubescent iiv lines, corymbose 

 or racemose-branched ; heads in short racemes ; leaves lanceolate, acute or acu- 

 minate at both ends, smooth, rough on the margins, the lower ones sharply ser- 

 rate ; scales of the involucre linear-subulate, loosely imbricated. — Low ground, 

 Florida, and northward — Stem 3° -6° high, sparingly or diffusely branched. 

 Leaves 2' - 4' long. Raj^s pale blue. 



33. A. tenuifolius, L. Nearly smooth ; stem paniculately branched ; 

 the rather small heads disposed in panicled racemes ; leaves long, narrow-lance- 

 olate, tapering to a long and slender point ; the lower ones commonly serrate in 

 the middle ; scales of the involucre numerous, linear-subulate, appressed. — 

 Low ground in the upper districts, Georgia, and northward. — Stem 2° -3° 

 high. Leaves 3' - 6' long. Rays short, pale purple or white. 

 ******* Leaves lanceolate or ohlong, sessile, the vpper ones more or less clasp- 



irifj: heads large or middle-sized : scales of the involucre nearly equal, with spread- 

 ing green tips : rai/s mostlif large and numerous, blue or purple. 



34. A. Novi-Belgii, L. Nearly smooth ; stem stout ; leaves oblong- 

 lanceolate, pale or somcwliat glaucous, serrate in the middle, acute or tapering 

 at each end ; scales of the involucre rather closely imbricated, with broadish 



