softly grayish-pubescent; phyllaries in 2 or 3 size-classes, the outer much shorter 

 than the inner, oblong-linear, blunt (outer) to acutish (inner), the margins and 

 tips thin and whitish; flowers whitish. 



Infrequent in moist sand, along streams in woods, ponds and swamps in Okla. 

 (Adair and Woodward cos.) and in e. Tex., late summer-fall; most of e. U.S. 



2. Eupatorium maculatum L. Joe-pye weed. 



Fibrous-rooted perennial, 6-20 dm. tall, the stem speckled or sometimes more 

 evenly purplish, viscid-puberulent above; leaves mostly in 4's or 5's, lance- 

 elliptic to lanceolate or ovate-lanceolate, tapering to apex and to base, with a 

 short petiole or subsessile, mostly 6-21 cm. long and 2-9 cm. wide, pinnately 

 veined, sharply and rather coarsely serrate; inflorescence or its divisions flat- 

 topped or nearly so; involucre 6.5-9 mm. high, often purplish, its imbricate 

 obtuse phyllaries few-striate, or at least with prominent midvein; flowers purple, 

 9 to 22 (rarely only 8) in each head; corollas about 5 mm. long; achenes atomi- 

 ferous-glandular, 3.4-4.2 mm. long. 



Damp thickets, meadows, edges of marshes, especially in rich or calcareous 

 soils along streams, in N.M. (scattered) and Ariz. (Apache, Navajo and Coconino 

 COS.), July-Sept.; Nfld. to B.C., s. to Md., O., 111., N.M. and Ariz. 



Var. Bruneri (Gray) Breitung is found in New Mexico and some of the plants 

 from Arizona may well be this variety with seldom very large leaves but usually 

 firm in texture and covered with short spreading hairs underneath. 



3. Eupatorium purpureum L. Joe-pye v^^eed. 



Fibrous-rooted perennial mostly 6-20 dm. tall, glaucous when fresh, green, 

 purple at the nodes, solid; leaves mostly in 3's or 4's, lanceolate or ovate to 

 elliptic, mostly 8-30 cm. long and 2.5-15 cm. wide, gradually tapering to abruptly 

 cuneate at the base, pinnately veined, usually sharply and coarsely toothed, loosely 

 soft-pubescent to subglabrous beneath, usually minutely atomiferous-glandular; 

 inflorescence a paniculate corymb rounded at the summit; involucre imbricate, 

 6.5-9 mm. high; heads 3- to 8-flowered; corollas 4.5-7.5 mm. long, creamy-white, 

 pale pink or purplish; achenes 3-5 mm. long. 



On wooded slopes, low moist ground, swampy meadows and thickets, borders of 

 sloughs and streams, in Okla. (Waterfall), July-Sept.; N.H. to Minn, and Neb., s. 

 to Fla., Tenn., Ark. and Okla. 



When this plant is fresh and is bruised it has a sweet vanilla scent. 



4. Eupatorium coelestinum L. Mist-flov^er. Fig. 747. 



Rhizomatous perennial; stems weak, scandent, to 2 m. tall; leaves opposite; 

 blades pubescent, minutely resin-dotted, deltoid, 2-7 cm. long, serrate; petioles 

 3-20 mm. long; heads in roughly corymbiform aggregations at the ends of the 

 branches; involucres hemispheric, 3-5 mm. high; phyllaries in roughly 3 series 

 (the 2 inner series about equal, the outer a little shorter), linear-subulate, pubes- 

 cent, obscurely 3-nerved; receptacle conical, naked; flowers numerous, the 

 corollas blue or purplish-blue. Conoclinium coelestinum (L.) DC. 



Frequently in moist sandy wooded areas, edges of ponds, along streams and in 

 seepage, in Okla. (Ottawa, McCurtain, Adair, Mayes, Osage and Pushmataha cos.), 

 e. and s.e. Tex. (s. to Kleberg Co.), less frequent w. to n.-cen. Tex., summer-fall; 

 N.J. to Kan., s. to Gulf States. 



5. Eupatorium betonicifolium Mill. 



Rather similar to £. coelestinum but plants usually not scandent, not more 

 than 1 m. tall, much of the stem reclining (and node-rooting), only the last 2-3 

 dm. of the flowering branch ascending and it having very few scattered nodes; 



1603 



