DICOTYLEDONS. 237 



1. E. PURPUREUM L. Purple Boneset. Stem erect, smooth 

 or slightly pubescent, often striate, branched above, 3-10 ft. high ; 

 leaves 3-6 in a whorl, lanceolate to ovate, petioled, coarsely serrate, 

 roughened; heads in large, compound corymbs, 5-10-flowered; bracts 

 purplish, obtuse, imbricated in several rows, the outer shorter; flowers 

 pink or purple. fJuly-September. In moist woods. 



2. E. ALBUM L. White Thoroughwort. Stem erect, rough- 

 pubescent or hairy, branched above, 1-3 ft. high; leaves opposite, 

 lanceolate to oblong, obtuse or acute at the apex, narrowed at the 

 base, nearly or quite sessile, serrate, strongly veined ; heads numer- 

 ous, in dense corymbs, o-flowered ; involucre slender, its bracts in 

 2-3 series, linear to lanceolate, with white and scarious edges, the 

 tips mucronate ; flowers white. July-vSeptember. Common on dry, 

 sandy soil. 



3. E. ROTUNDIFOLIUM L. ROUND-LEAVED ThOROUGHWORT. 



Stem erect, rough-pubescent, simple or branched above, 2-3 ft, high; 

 leaves opposite, broadly ovate to roundish, truncate and sessile at 

 the base, obtusely serrate, 3-ribbed, rugose ; corymbs large, heads 

 5-flowered ; involucre spreading, its bracts in 2-3 series, lanceolate, 

 densely pubescent ; flowers white. June-September. On dry soil. 



4. E. PERFOLiATUM L. BoNESET. Stem erect, stout, pubescent 

 or hairy, branched above, 2-4 ft, high ; leaves opposite, lanceolate, 

 connate-perfoliate, crenate-serrate, rugose, with a prominent vein near 

 the margin; corymb large and spreading; heads about 10-flowered; 

 involucre spreading, the bracts linear-lanceolate, acute ; flowers white. 

 July-September. On low ground. A ]io]>ular domestic remedy. 



."). E. {(ELESTiNUM L. MisT Elower. Stem erect, slender, 

 smooth or pubescent, widely l)ranched, 2-3 ft. high ; leaves opposite, 

 ovate to deltoid or sometimes cordate, acuminate at the apex, 

 jtftioled, coarsely dentate; corymbs spreading, heads many-flowered; 

 involucre spreading, bracts nearly e(iual, linear-laneeolate : flowers 

 Mue or purple. June-Se]>tember. On rich soil. 



in. LACINARIA. 



Perennial from tuberous roots ; stems usually simple ; 

 leaves alternate, narrow, entire ; beads discoid, spiked or 

 racemed, few- or many-Howered ; involuere oblong or bell- 

 shaped, its bracts imi)ricated in several rows, the outer 

 shorter; receptacde naked; corollas slender, ])urple to white; 

 a(dienes slen(ler, narrowed to the base, 10-ribbed ; pappus of 

 numerous ])lumose bristles. 



1. L. stiUARKosA (L.) Hill. Hi.A/iNci-sTAK. Stem erect, stout, 

 simjde. smooth oi* pul>esi-ent. 1 2 ft. high: leaves nninerons, linear. 



