COMPOSITE. (composite FAMILY.) 215 



than the flowers, the acuminate or mucronate tips white and scarious. — Dry- 

 sandy soil. Sept. — Stem l°-2° high. Leaves 2' long. 



14. E. altissimum, L. Stem tomeutose; leaves opposite, lanceolate, 

 acute, pubescent, strongly 3-ribbed, sharply serrate above the middle, nar- 

 rowed at the base ; corymb dense, hoary ; scales of the involucre shorter than 

 the flowers, linear-oblong, obtuse. — Sterile soil. North Carolina, and westward. 

 Sept. — Stem 3° - 7° high. Leaves 3' - 4' long. 



15. E. sessilifolium, L. Smooth; leaves long, lanceolate, acuminate, 

 serrate, rounded and closely sessile at the base ; corymb tomeutose ; scales of 

 the involucre oblong, obtuse. — Open woods in the upper districts, Alabama, 

 and northward. Sept. — Stem 2° - 4° high, mostly branching above. Leaves 

 3' - 6' long, thin and veiny. 



16. E. mikanioides, Chapm. Stem ascending from a creeping base, 

 branching and tomeutose above; leaves opposite, long-petioled, deltoid, 

 glandular-serrate or toothed, truncate or abruptly acute at the base, resinous- 

 dotted above, pubescent on the veins beneath ; the petioles somewhat connate ; 

 corymb ample ; scales of the involucre about 10, lanceolate, acute ; anthers 

 slightly exserted ; achenia 5-angled, glandular. — Low sandy places on the 

 coast of West Florida. Sept. — Stem l°-2° high. Leaves T-l^' long, 

 somewhat fleshy. 



•1- -I— Heads in panicled racemes, 3 - 5-Jiowered : leaves pinnutely divided. 



17. E. foeniculaceuin, 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. Sept. -Oct. — Stem 3° -8° high. Flowers 

 white. 



18. E. COronopifolium, Willd. Pubescent; stem paniculately 

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

 the involucre mucronate, pubescent, margined ; achenia smooth. — Dry sandy 

 soil. Sept. -Oct. Stem 2° - 4° high. Flowers white. 



-(- -I- -1- Heads 6-\5-Jlowered : leaves opposite. 

 ■*-*■ Leaves sessile or perfoliate. 



19. E. pinnatifidum, Ell. Pubescent; leaves lanceolate, pinnately 

 lobed or pinnatifid, the uppermost linear and entire, tlie lowest ones whorled ; 

 heads 6 - 9-flowered ; scales of the involucre lanceolate, acute. — Dry soil, 

 Florida to North Carolina. Sept. — Stem 2° - .3^ high. 



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

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

 foliate ; heads about 10-flowered ; scales of the involucre linear-lanceolate, 

 acute. — Low ground. Sept. — Stem stout, 2° - 3° high. Leaves 6' - 8' long. 



++ ++ Leaves petioled. 



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

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

 heads 12- 1 5-flowered ; scales of the involucre linear-oblong, obtuse ; achenia 

 smooth. — Rich soil. Sept. — Stem 3° - 6° high. Leaves 4' - 9' long. 



