COMPOSITE. (COMPOSITE FAMILY.) 225 



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

 sharply serrate. 



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

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

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

 a single row, longer than the disk; acheuia 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. DCELLINGERIA & LvNTHE. Pappus double, the outer row short and bristly, 

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



* Involucre as Ion;/ as the disk: rays purple. 



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

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

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

 appressed ; acheuia silky. Dry open woods. Sept. Stem 1 high. Leaves 



1' long. 



* * Inrolucre shorter than the disk : rai/s white. 



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

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

 spreading peduncles; acheuia smooth. Upper 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 ; acheuia smooth. Swamps. 

 Sept. Stem 2 - 4 high ; the branches spreading. Leaves 1^' - 2' long. 



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

 lanceolate, acuminate ; scales of the involucre acutish ; acheuia 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 ; acheuia 

 hairy. 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. Rays very numerous, pistil- 

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

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

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

 nate. Rays white or purplish. 



* Rays longer than the disk. 

 - Very numerous, filiform. 



1. E. strigOSUS, Muhl. Annual, rough-pubescent; stem corymbose- 

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



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