326 composite:. Liatris. 



the plant is very robust, the lower part of the spike is somewhat branched. Heads often an 

 inch in diameter. Scales with a broad rounded summit, and a little scarious on the margin. 

 Flowers bright purple. Corolla smooth inside. Achenium about the length of the pluraose- 

 barbellate pappus. 



Sandy, moist bushy places ; Long Island, particularly in Suffolk County. Fl. August - 

 September. I have not seen this very handsome species in any other part of the State. 



3. EUPATORIUM. Toiirn. i?ist. t. 259 ; Endl. gen. 2280. HEMP-WEED. 



[ Named after Eujyatur, king of Pontus, who is said to have used one of the species as a medicine.] 



Heads 3 - many-flowered. Involucre cylindrical or campanulate ; the scales imbricated in 

 2 - 3 or more series, or sometimes nearly equal in a single series. Receptacle flat, naked. 

 Corolla tubular-funnelform, or often with a campanulate limb, 5-toothed, frequently dilated 

 at the base. Anthers included. Branches of the style mostly exserted and elongated, 

 cylindraceous or somewhat flattened, obtuse. Achenia 5-angled, without intermediate stris. 

 Pappus a single series of very slender capillary bristles, rough or minutely serrulate. — 

 Perennial herbs, often sprinkled with resinous dots, with opposite (rarely alternate or 

 verticillate) simple or rarely divided leaves. Heads corymbose. Flowers purple, blue or 

 white. 



§ 1. Heads cylindrical, 5- \Q-Jlov)ered : scales of the involucre colored, obtuse, imbricated in several 

 series, the outermost much shortest : leaves verticillate ; flowers purplish. 



1. EuPATORiuM PURPUREUM, LiiiTi. JoB Pye Weed. 



Stem sout, simple, hollow or nearly solid ; leaves 3 - 6 in a whorl or rarely opposite, oblong- 

 ovate or lanceolate, more or less petioled, acuminate, veiny, rough or smooth above, somewhat 

 pubescent underneath and sprinkled with resinous dots, serrate ; heads in a large compound 

 corymb, 5 - 9-flowered ; achenia smooth, glandular. — Linn. sp. (cd. 1.) 2. p. 838 ; Hook, 

 fl. Bor.-Am. 1. p. 304 ; Darlingt. fl Cest. p. 453 ; Torr. <f- Gr. fl. N. Am. 2 p. 82. E. 

 trifoliatum, Linn. I. c. E. purpureum, maculalum, verticillatum, ternifolium and dubium, 

 DC. prodr. 5. p. 151. 



var. 1. Stem tall, somewhat smooth and glaucous, purple at the nodes (and sometimes 

 throughout) ; leaves mostly 4 - 6 in a whorl, slightly petioled, oblong-ovate or oblong- 

 lanceolate, serrate, often rugosely veiny (smooth and even in shady places). — Torr. <^ Gr. 

 I. c. E. purpureum, Linn. sp. ed. 2. p. 1 173 ; Willd. sp. 3. p. 1759 (partly) ; Michx. fl. 2. 

 p. 98 ; Bigel. fl. Bost. p. 297. E. verticillatum, Willd. I. c. E. trifoliatum, Darlingt. I. c. 

 E. angustifolium, Torr. cat.pl. N. York. E. falcatum, Michx. I. c. 



var. 2. Stem mostly striate or grooved, pubescent and often glandular or viscid above, 

 marked with purple linear spots ; loaves mostly 3-4 (sometimes 5) in a whorl, ovate, pe- 



