10G COMPOSITE. (composite family.) 



15. E. perfoliatum, L. Pubescent or hairy; loaves lanceolate, ai ami- 

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



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

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

 Leaves 6'-S' long. 



*-*■ ■*-<• Leaves petiokd. 



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

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

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

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

 3°- G° high. Leaves 4'- 9' long. 



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

 pctioled, 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, l'-U' long. 



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

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

 IS. 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. — Ilieh 

 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- 

 l.Vllowon d ; scales of the involucre linear; achenia smooth. (E. ceanothi- 

 folium, Willd.) — Dry open woods, common. Sept. — Stem 2° high. Leaves 

 1'- 2' long. Flowers white. 



20. E. incarnatum, "Walt. Pubescent; stem slender, reclining, diffusely 

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

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

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

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

 long. Flowers pale purple. 



f) 2. Heads in panicled racemes : leaves pinnately divided. 



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

 branched ; divisions of the leaves filiform, smooth ; heads 8-5-flowered; Bcales 

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



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



Sept and Oct — Stem :i° - 8° high. Flowers white. 



22. E. coronopifolium, Willd. Pubescent; Btem paniculately branched ; 

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



lucre mucronate, pubescent, margined; achenia smooth.-- Dry Bandy soil, 



Florida to North Carolina. Sept. and Oct — Stem 2° - 4° high. Flower-. 



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



