GENUS 4. 



THISTLE FAMILY. 



357 



4. Eupatorium purpureum L. Joe-Pye or Trumpet-weed. Gravel-root. Tall 



or Purple Boneset. Fig. 4155. 



Eupatorium purpureum L. Sp. PI. 838. 1753. 

 E. falcatum Michx. Fl. Bor. Am. 2 : 99. 1803. 

 Eupatorium purpureum var. angustifolium T. & G. Fl. 



N. A. 2: 82. 1841. 

 Eupatorium purpureum falcatum Britton, Mem. Torr. 



Club 5 : 312. 1894. 



Glabrous or sparingly pubescent, simple or 

 branched at the summit, 3-io high. Stem green 

 or purple, terete or striate, usually smooth ; leaves 

 thin, verticillate in 3's-6's, ovate, oval, ovate-lan- 

 ceolate or narrowly lanceolate, petioled, acumi- 

 nate, serrate, 4'-i2' long, 6"-3' wide, glabrous or 

 slightly pubescent along the veins on the lower 

 surface ; inflorescence usually elongated ; heads 

 very numerous ; involucre cylindric, its bracts 

 pink, oblong, obtuse, imbricated in 4 or 5 series, 

 the outer shorter; flowers pink or purple, occa- 

 sionally white. 



In moist soil, New Brunswick to Manitoba, Flor- 

 ida and Texas. Kidney-root. Skunk-weed. Indian 

 gravel-root. Marsh-milk weed. Nigger-weed. Quill- 

 wort. Motherwort. King- or queen-of-the-meadow. 

 Aug.-Sept. 



Eupatorium trifoliatum L. has the teeth of the 

 leaves bluntly apiculate, but otherwise closely re- 

 sembles E. purpureum and may not be specifically 

 distinct. 



5. Eupatorium serotinum Michx. Late- 

 flowering Thorough wort. Fig. 4156. 



E. serotinum Michx. Fl. Bor. Am. 2: 100. 1803. 



Much branched, finely and densely pubescent, 

 or glabrate below, 4-8 high. Leaves all slen- 

 der-petioled, lanceolate or ovate-lanceolate, acu- 

 minate, sharply serrate, 3'-6' long, '-2' wide, 

 5-nerved at the base, the lower opposite, the 

 upper alternate; heads very numerous, the in- 

 florescence broadly cymose; heads 7-i5-flow- 

 ered, 2"-$" high ; involucre campanulate, its 

 bracts pubescent, linear-oblong, obtuse or trun- 

 cate, imbricated in 2 or 3 series, the outer 

 shorter; flowers white. 



In moist soil, Delaware to Florida, Minnesota, 

 Iowa, Kansas and Texas. Sept.-Nov. 



6. Eupatorium leucolepis T. & G. White- 

 bracted Thoroughwort. Justice-weed. 



Fig- 4I57- 

 E. leucolepis T. & G. Fl. N. A. 2 : 84. 1841. 



Slender, puberulent, branched above, i-2 

 high. Leaves opposite, sessile, linear, oblong 

 or oblong-lanceolate, glaucous green, rough on 

 both sides, thick, blunt-pointed, sparingly ser- 

 rate, or the upper entire, i'-3' long, 2"-5" wide, 

 obscurely 3-nerved and narrowed at the base ; 

 inflorescence cymose-paniculate ; heads 3"-4" 

 high, about 5-flowered ; bracts of the narrow 

 involucre imbricated in about 3 series, white, 

 lanceolate, acute, densely canescent, the outer 

 shorter ; flowers white. 



In moist places, Massachusetts and Long Island 

 to Florida, Georgia and Louisiana. Aug.-Sept. 



