COMPOSITE. (composite FAMILY.) 225 



coast, Florida, and northward. Oct. — Stem 2° - 3° high. Lowest leaves 

 sharply serrate. 



45. A. exilis, Ell. ? Stem diffusely branched ; leaves linear-subulate ; 

 the lowest ones linear, tapering at the base ; lieads small, loosely panicled, on 

 spreading peduncles ; scales of the involucre linear-subulate, smooth ; rays in 

 a single row, longer than the disk ; achenia 4-ribbed, hairy. — Marshes along 

 the coast, Florida to South Carolina. Sept. — Stem l°-3° high. Lowest 

 leaves oval or lanceolate, toothed ; those of the branches short and bract-like. 

 Rays blue. 



§ 7. DcELLiNGEKiA & Ianthe. Pappus double, the miter row short and bristly, 



the inner long and capillary : scales of the involucre without herbaceous tips. 



* Involucre as lonrj as the disk: rays purple. 



46. A. linariifolius, L. Stem rigid, simple, closely pubescent ; leaves 

 numerous, liuear, .spreading, the margins very rough ; heads solitary or some- 

 what racemose ; scales of the involucre imbricated in several rows, linear, 

 appre.ssed ; achenia silky. — Dry open woods. Sept. — Stem 1° high. Leaves 



r long. 



* * Involucre shorter than the disk: rays white. 



47. A. infirmus, Michx. Stem pubescent ; leaves elliptical, tapering at 

 each end, hairy on the margins and veins beneath ; heads few, on slender 

 spreading peduncles; acheuia smooth.— L^pper districts of Carolina, and 

 northward. August. — Stem 1°- 2° high. Leaves 2' -4' long. 



48. A. amygdalinus, Torr. & Gray. Stem roughish and corymbose 

 above ; leaves oval or oblong, acute at each end, nearly smooth ; heads numer- 

 ous, corymbed ; scales of the involucre obtuse ; achenia smooth. — Swamps. 

 Sept. — Stem 2° - 4° high ; the liranches spreading. Leaves 1^' - 2' long. 



49. A. umbellatus, Mill. Stem smooth, corymbose above ; leaves 

 lanceolate, acuminate ; scales of the involucre acutish ; achenia smooth. — 

 Swamps in the upper districts. Sept. — Stem 3° - 6° high. Branches erect. 

 Leaves 3' - .5' long. 



50. A. reticulatus, Pursh. Closely pubescent ; stem simple, scaly at 

 the base ; leaves oblong, sessile, strongly veined ; heads large, corymbed, on 

 long and naked (whitish) peduncles; scales of the involucre acute ; achenia 

 hairv. — Low pine barrens, Florida to South Carolina. May - July. — Stem 

 1° - 2° high. Leaves 1' - 2' long. 



17. ERIGERON, L. Fleabane. 



Heads mostly hemispherical, many-flowered. Eays very numerous, pistil- 

 late. Scales of the involucre nearly equal, in 1-2 rows. Receptacle flat, 

 nakeil. Achenia compressed. Pappus a single row of capillary bristles ; or 

 with an outer row of short chaffy scales or bristles. — Herts. Leaves alter- 

 nate. Rays white or purplish. 



* Eays longer than the disk. 

 •1- Very numerous, filiform . 

 \. E. strigOSUS, Mithl. Annual, rough-pubescent; stem corymbose- 

 panicled above ; leaves entire or sparingly serrate, the lowest oblong, tapering 



lo' 



