CARDUACEAE. 



389 



volucre ovoid, eampanulate, or nearly hemispheric, its bracts appresseil, herba- 

 ceous, imbricated in several series. Eeceptacle flat, naked. Outer flowers of 

 the head pistillate, their corollas filiform, 3-cleft or dentate at the apex. Cen- 

 tral flowers perfect, but mainly sterile, their corollas 5-cleft. Anthers sagittate 

 at the base, the auricles caudate. Style of the perfect flowers 2-cleft or un- 

 divided. Achenes 4-5-angled. Pappus a single series of capillary scabrous 

 bristles. [Named for the Abbe N. A. Pluche, of Paris.] About 35 s-pecies, 

 widely distributed in warm and temperate regions. Type species: Conyza 

 marilandica Michx. 



Perennial ; shrubby ; leaves entire. 

 Annual ; herbaceous ; leaves crenate. 



1. Pluchea odorata Cass. Shrubby 

 Fleabane. (Fig. 423.) Perennial, 

 closely pubescent. Stems 3°-8° tall, 

 woody. Leaves oblong or nearly so, 3'- 

 6' long, obtuse or apiculate, entire, peti- 

 oled; heads numerous, in rounded 

 corymbs; involucre about 1" high, its 

 bracts oblong or slightly broadened up- 

 ward, pubescent, ciliate, obtuse. [Conyza 

 odorata L.] 



Hillsides and thickets. Native. Florida 

 and tropical America. Flowers from spring 

 to autumn. Its achenes probably reached 

 Bermuda on the wind. 



1. r. odorata. 



2. 1'. purpurascens. 



2. Pluchea purpurascens (Sw.) 

 DC. Salt Marsh Fleabane. (Fig. 

 424.) Annual, finely pubescent and 

 somewhat glandular. Stems 1°- 

 4" tall, branching above; leaves 

 ovate-lanceolate to elliptic or ob- 

 long, lV-4' long, rather blunt, 

 coarsely crenate, short-petioled ; 

 heads few or numerous; involucre 

 about 2" high; bracts oblong to 

 narrowly linear-lanceolate, cilio- 

 late, the outer mucronate, the inner 

 acute or acuminate; flowers pur- 

 ple; corollas of the pistillate flow- 

 ers about IV' long. [Conyza pur- 

 purascens Sw. ; P. camphorata of 

 Eeade, Hemsley, Verrill and 

 Moore.] 



Common in marshes. Native. 



Southern United States and West 



Indies. Its achenes probably reached 



Bermuda on the wind. Flowers from 



spring to autumn. 



