Evpatorium. COMPOSITE. 95 



coriaceous, hardly striate, prominently appendaged by deltoid spreading foliaceous tips : 

 flowers probably purplish. — " California," Coulter, no. 294. But the same as 253 of Upper 

 Souora iu the Mexican collection, doubtless the real habitat. Yet may reach into Arizona. 

 (Adj. j\Iex., Coulter, Grer/ff, Palmer.) 



E. ivsefolium, L. Herbaceous or merely suffrutescent, somewhat hirsute or pubescent, 

 strictly erect, 2 to 5 feet high : leaves lanceolate or the upper ones linear, hardly petioled, 

 3-uerved, sparsely and often coarsely serrate at the middle, mostly obtuse, roughish, an inch 

 or two long: heads small (3 or 4 lines long), 10-20-flowered, in small and loose cymes: 

 bracts of the cyliudraceous involucre oblong, striate, with the very short somewhat truncate 

 tips purple or greenisli and slightly squarrose-spreadiug : flowers liglit purplish-blue or 

 reddish. — Anioeu. Acad. v. 405, & Spec. ed. 2, 1174; Torr. & Gray, Fl. ii. 81 ; Griseb. Fl. 

 W. Ind. 359 ; Baker in Fl. Bras. 1. c. 290. {E. obscurum, DC, & E. concinmtm, Hook. & Arn., 

 ex Baker.) E. ccdocephalian, Xutt. iu Trans. Am. Phil. Soc. n. ser. vii. 286. Liatris 

 opposit [folia, Kutt. iu Am. Jour. Sci. v. 299. — Old fields, &c.. Lower Mississippi, Louisiana, 

 and Texas ; the var. Ludovlcianum, Torr. «& Gray, 1. c, a form with less serrate leaves and 

 less s(piarrose involucre, the tips of the upper scales mostly petaloid and purple. (W. Ind. 

 & Mex. to S. Brazil.) 



* * Invcihicral bracts wholly inappendiculate and appressed. 



E. heteroclinium, Griseb. Herbaceous, with somewhat ligneous base, 2 or 3 feet high, 

 ratlier strong-scented, pubescent : branches ascending : leaves rather short-petioled, ovate- 

 lanceolate with cuncate or truncate base to deltoid, obtusely serrate, 3-nerved, about an inch 

 long: heads scattered, 5 or 6 lines long, 20-25-flowered, short-peduncled : involucre cyliu- 

 draceous, glabrous, smooth and somewhat shining, pale; the bracts very obtuse, about 

 7-striate, more than usually deciduous : receptacle of the purple or bluish flowers convex. — 

 Fl. Brit. W. Ind. 358. ConocUnium r'ujidum, Chapm. in Bot. Gazette, iii. 6, not DC. — Keys 

 of S. Florida, Blodijitt, Chapman, Curtiss. (Jamaica.) 



E. conyzoides, Vahl. Shrubby, with herbaceous divergent flowering branches, 4 to 10 

 feet liigh, from villous-pubescent to glabrate : leaves sleuder-petioled, ovate-lanceolate, vary- 

 ing to ovate, acuminate, mostly cuneate at base, sparsely and acutely serrate or sometimes 

 entire, 3-nerved or triplinerved (larger 3 to 5 and smaller 1 or 2 inches long) : heads numer- 

 ous in the corymbiform open cymes, a third to half-inch long, 12-30-flowered : involucre 

 cylindraceous or cylindrical, glabrous ; the bracts 3-5-striate, rounded and somewhat green- 

 ish at the tip: receptacle of the pale blue or white flowers flat. — Symb. iii. 9G ; Schrank, 

 Hort. Monac. t. 85; Baker, 1. c. E. odoratum, L., in part. — Along the Rio Grande on the 

 Mexican border of Texas, Berlandier, ScJiott, Bujdoic, &c. Mouths of the Mississippi, 

 Trend. E. Sabeanum, Buckley in Proc. Acad. Philad. 18G1, 45G. The form with stouter 

 heads and firmer greenish-tipped involucral bracts, common in Mexico, &c. {E. Jioribundum, 

 HBK., E. divergens. Less., E. Maximd.iani, Schrader, E. conyzoides folio molli et incano, etc., 

 Pluk. t. 177, fig. 3), not the W. Indian form with more slender and pallid fewer-flowered 

 involucre, and innermost bracts often acute, which approaches E. odoratum. (Trop. 

 Amcr.) 



§ 2. EuPATORiuM proper. Involucre various ; the bracts from thin-membra- 

 naceous or scarious to herbaceous, nerveless or few-nerved, mostly lax, either 

 imbricated or equal and nearly uniseriate : receptacle flat, not hairy. 



* Involucre cylindrical and imbricate in the manner of § 1, but thin-membranaceous and some- 

 what scarious when dry, faintly 3-striate: heads very numerous, corynibitbrm-cymose, mostly 

 5-10-tlowered: leaves vcrticillate: stem herbaceous: herbage nearly destitute of resinous glob- 

 ules. — § Verticillata, DC. 



E. purptireum, L. (Joe-Pye Weed, Trumpet Weed.) From pubescent to nearly 

 glai irons : stems simple, 3 to 9 feet higli, usually lineolate-punctatc, often fistular : leaves com- 

 monly 3-6-nate, from oval-ovate to oblong-lanceolate, acuminate, coarsely serrate, reticulate- 

 veiny, the base narrowed into a short petiole : cymes polycephalous, compound-corymbose and 

 numerous : involucre (3 or 4 lines long) whitish and flesli-colored : flowers dull flesh-color or 

 purple, rarely almost white. — Spec. ii. 838 (Corn. Cauad. t. 72; Ilerm. Parad. t. 158; 

 Moris. Hist. vii. t. 18) ; Torr. & Gray, Fl. ii. 81. E. trifoliatum, L. 1. c, pi. Gronov. Virg. 

 E. maculatum, L. Amoeu. iv. 288, & Spec. ed. 2, 1174 ; Bart. Fl. Am. Sept. t. 102. E. verti- 



