196 COMPOSITE. (COMPOSITE FAMILY.) 



15. E. perfoliatum, L. Pubescent or hairy; leaves lanceolate, acumi- 

 nate, crenate-serrate, rugose, sessile and clasping at the base, or connate-perfoli- 

 ate ; heads about 10-flowered ; scales of the involucre linear-lanceolate, acute. 

 Low ground, Florida and northward. Sept. Stem stout, 2 -3 high. 

 Leaves 6' -8' long. 



M- -M- Leaves petioled. 



16. E. serotinum, Michx. Pubescent; stem tall, mostly branching; 

 leaves long-petioled, ovate-lanceolate, acuminate, sharply serrate, 3-ribbed ; 

 heads 12-15-flowered ; scales of the involucre linear-oblong, obtuse; achenia 

 smooth. Rich soil, Florida to North Carolina, and westward. Sept. Stem 

 .3 - 6 high. Leaves 4'- 9' long. 



17. E. villosum, Swam. Stem tomentose, branching ; leaves short- 

 petiolcd, ovate, obtuse or mucronate, rusty-pubescent, denticulate or entire, 3- 

 ribbed; corymb dense; heads 10-15-flowered ; scales of the involucre about 

 10, equal, linear, obtuse, shorter than the flowers; anthers slightly exserted; 

 achenia hispid ; pappus shorter than the flowers. South Florida. Leaves 

 rigid, 1'- 4' long. 



* * * # Scales of the involucre (green) equal, in a single row: heads 8-30-Jiow- 

 ered : leaves, achenia, Sj-c. not resinous-dotted : leaves on slender petioles. 



18. E. ageratoides, L. Smooth; leaves thin, ovate or slightly cordate, 

 acuminate, coarsely and sharply serrate, 3-ribbed ; heads 10 - 20-flowered ; scales 

 of the involucre linear, acutish, slightly pubescent ; achenia smooth. Rich 

 shaded soil, Florida to Mississippi, and northward. Sept. Stem commonly 

 branching, 2 3 high. Leaves 3' -5' long. Flowers white. 



19. E. aromaticum, L. Pubescent; leaves thickish, ovate, or the low- 

 est cordate, crenate-serrate, roughish, on short petioles, barely acute ; heads 8 ~ 

 1 5-flowered; scales of the involucre linear; achenia smooth. (E. ceanothi- 

 folinm, Willd.) Dry open woods, common. Sept. Stem 2 high. Leaves 

 1'- 2' long. Flowers white. 



20. E. incarnatlim, Walt. Pubescent ; stem slender, reclining, diffusely 

 branched ; leaves on long petioles, deltoid, acuminate, truncate or coidate at the 

 base, coarsely serrate ; corymbs numerous, small ; heads about 20-ttowered ; 

 scales of the involucre linear, acute, 2-ribhed ; achenia hispid. Rich shaded 

 soil, Florida to North Carolina. Sept. Stem 2 -4 long. Leaves l'-2' 

 long. Flowers pale purple. 



2. Heads in panided racemes : leaves pinnately divided. 



21. E. fcenieulaceum, Willd. Stem tall, pubescent, paniculately much 

 branched ; divisions of the leaves filiform, smooth ; heads 3 - 5-flowered ; scales 

 of the involucre smooth, margined, notched at the apex, mucronate ; achenia 

 smooth. Chiefly in old fields, Florida to North Carolina, and westward. 

 Sept. and Oct Stem 3 - 8 high. Flowers white. 



22. E. COronopifolium, Willd. Pubescent ; stem paniculately branched ; 

 divisions of the leaves linear ; heads crowded, 5-flowered ; scales of the invo- 

 lucre mucronate, pubescent, margined ; achenia smooth. Dry sandy soil, 

 Florida to North Carolina. Sept. and Oct. Stem 2 -4 high. Flowers 

 white. Probably a broader-leaved form of the preceding. 



