1. Pluchea camphorata (L.) DC. Camphor-weed. 



Annual or perennial herb to about 15 dm. tall; stems glabrate below, puberulent 

 on the upper portions and the head-bearing branchlets, leafy to the summit; blades 

 elliptical to oblong-elliptical, 6-15 cm. long, 3-7 cm. broad, marginally dentate- 

 serrate to repand-serrate or essentially entire, upper and lower surfaces with 

 sparsely distributed resin-globules, the lower surfaces puberulent; overall aggrega- 

 tions of heads characteristically elongate-paniculiform, the branches numerous 

 and terminating in smaller convex panicled cymose clusters, the central uppermost 

 "cymes" maturing first but the lateral ones not equaling them in height, occa- 

 sionally only one terminal "cyme" of heads developing on the entire plant; 

 phyllaries with resin-globules, the outermost sparingly pubescent and ciliate, the 

 median and inner not pubescent. 



Frequent in moist places, sometimes salt marshes and alkaline soil in Okla. 

 (LeFlore, McCurtain, Pittsburg and Stephens cos.), e., s.e. and n.-cen. Tex., 

 N.M. (Chaves Co.) and Ariz. (Coconino, Mohave, Maricopa, Pinal and Yuma 

 COS.); summer-fall; Me. to Tex., Nev. and Calif., s. to Mex. 



2. Pluchea purpurascens (Sw.) DC. Canela. Fig. 752. 



Annual herb to about 15 dm. tall; stems glabrate below, copiously puberulent 

 on the upper portions and on the cyme-bearing branches, the latter sometimes 

 cinereous or sordid, leafy to the summit; leaves sessile or petiolate, generally 

 short-ovate to ovate-lanceolate, sometimes lanceolate or elliptical, the apexes 

 generally obtuse varying in the more lanceolate or elliptical blades to long-acute, 

 the margins from evenly to unevenly serrate or serrate-dentate or entire; surfaces 

 of the blades varying from essentially glabrous or very sparsely puberulent to 

 copiously puberulent or essentially tomentose; overall placement of heads basically 

 cymiform, the central axis maturing first, the lateral branches equaling or exceed- 

 ing it in length, thus giving a flat-topped or layered structure; outer and median 

 phyllaries copiously puberulent and ciliate, the inner sparsely puberulent on the 

 summits. 



In wet and muddy places in Okla. (Osage, Alfalfa, Logan, Murray, Carter, 

 Stephens, Comanche and Kiowa cos.) and throughout Tex., summer-fall; s. half 

 of U.S. s. to n. S.A.; W.I. 



3. Pluchea foetida (L.) DC. Stinking fleabane. 



Perennial herb 5-8 dm. tall; stems glabrate below, sparingly pubescent in the 

 median portions, densely pubescent and approximately lanate on the head-bearing 

 branchlets; leaves 3-10 (-13) cm. long, 1-3 cm. broad, sessile; lower cauline 

 leaves lanceolate or oblanceolate with cuneate or truncate bases; median and upper 

 leaves oblong to oblong-elliptical or occasionally ovate-oblong, rarely lance-elliptic, 

 typically shallowly auriculate-clasping but occasionally the median and upper 

 leaves as well as the lower with cuneate bases; leaf margins shallowly and unevenly 

 apiculate-serrate; leaf surfaces glandular above, pubescent below; overall arrange- 

 ment of heads usually loose panicle-cymelike tending to be flat-topped; heads 

 about 8 mm. high; corollas creamy-white. 



Infrequent in mud, in ditches, marshes and savannahs, in e. and s.e. Tex., s. 

 to Aransas Co., summer-fall; s.e. U.S.; W.I. 



4. Pluchea rosea Godfrey. 



Perennial herb 30-55 cm. tall, gray-green; stems glabrate below; surfaces 

 of the stems, leaves and involucres with sessile hemispherical glands and resin- 

 globules, upper stems pubescent, the upper head-bearing branches and involucres 

 tomentose or sometimes rufescent; leaves sessile, the lower oblanceolate with 



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