Genus 4.] 



THISTLE FAMILY 



13. Eupatorium rotundifdlium L,. 

 Round-leaved Thoroughwort. 



Wild Hoarhound. (Fig. 3625.) 

 E. rolundifolium L. Sp. PI. 837. 1753. 



Rough-pubescent, branched at the sum- 

 mit, i-3 high. Leaves opposite, sessile, 

 broadly ovate, often as wide as long, acut- 

 ish or obtuse, truncate to subcordate at the 

 base, coarsely dentate-crenate, i / -2 / long, 

 ascending; inflorescence cymose-panicu- 

 late; heads about 5-flowered, 2 // ~3 // high; 

 involucre campanulate, its bracts linear-ob- 

 long, acute, densely pubescent, imbricated 

 in about 3 rows, the outer shorter; flowers 

 white. 



7 In dry soil, southern New York to Florida, 

 Kentucky and Texas. Reported from Canada, 

 but doubtful. July-Sept. 



14. Eupatorium pubescens Muhl. 

 Hairy Thoroughwort. (Fig. 3626.) 



E. pubescens Muhl. ; Willd. Sp. PL 3: 1755. 1804. 

 Eupatorium rolundifolium var. ovatum Torr. ; 

 DC. Prodr. 5: 178. 1836. 



Puberulent or pubescent, branched above, 

 usually taller than the preceding species. 

 Leaves opposite, ovate, sessile, often twice as 

 long as wide, acute at the apex, rounded or 

 truncate at the base, coarsely dentate with 

 acute or acutish teeth, or the lower incised- 

 dentate; inflorescence cymose-paniculate, 

 sometimes io / broad; heads 5-8-flowered, 

 2 // -3 // high; involucre campanulate, its 

 linear-oblong bracts in 2 or 3 series, the outer 

 shorter; flowers white. 



In dry soil, Massachusetts to Pennsylvania 

 West Virginia and Florida. Ascends to 3000 ft. 

 in Virginia. July-Sept. 



5 high. Leaves opposite, or rarely 

 3's, connate-perfoliate, divaricate, 



15. Eupatorium perfoliatum L,. 

 Common Thoroughwort. Bone- 

 set. Indian Sage. (Fig. 3627.) 

 E. perfoliatum L Sp. PI. 838. 1753. 

 Pubescent,- stout, branched above, 



2 



in 



lanceolate, long-acuminate with a slen 

 der apex, finely creuate-serrate, rugose 

 and pubescent beneath, 4 / -8 / long, \'- 

 \}/ z ' wide; heads crowded, 10-16-flow- 

 ered, 2 // -3 // high; involucre campanu- 

 late, its bracts lanceolate, acutish, im- 

 bricated in 2 or 3 series, pubescent, 

 the outer shorter; flowers white, rarely 

 blue. 



In wet places, New Brunswick to Mani- 

 toba, Florida, Nebraska and Texas. 

 Called also Ague-weed, Cross-wort. 

 Wild Sage, Thorough-wax. July-Sept. 

 Eupatorium perfoliatum truncatum ( Muhl. ) 



A. Gfay, Syn. Fl. i: Part 2. 99. 1804. 

 Eupatorium truncatum Muhl.; Willd. 



Sp. PI. 3: 1751- 1804. 



Leaves separated and truncate, or somewhat rounded at the base. 



Occasional with the type. 



