CAEDUACEAE. 



389 



Tolucre ovoid, campanulate, or nearly hemispheric, its bracts appressed, 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 

 Imstles. [Named for the Abbe N. A. Pluche, of Paris.] About 35 species, 

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

 marilandica Michx. 



Perennial ; shrubby : loaves entire. 

 Annual ; herbaceous ; leaves crenate. 



1. Pluchea odorata Cass. SHRUBBY 

 FLEABAXE. (Fig. 423.) Perennial, 

 closely pubescent. Stems 3-8 tall, 

 woody. Leaves oblong or nearly so, 3'- 

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

 oled; heads numerous, in rounded 

 corymbs; involucre about 1" high, its 

 bracts oblong or slightly broadened up- 

 ward, pubescent, eiliate, 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. P. odoratn. 



2. P. p uritu ruscens. 



2. Pluchea purpurascens (Sw.) 



DC. SALT MARSH FLEABAXE. (Fig. 

 424.) Annual, finely pubescent and 

 somewhat glandular. Stems 1- 

 4 tall, branching above; leaves 

 ovate-lanceolate to elliptic or ob- 

 long, 14'-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 14" long. {Conyza pur- 

 purascens Sw. ; P. camphorata of 

 Keade, Hemsley, Verrill and 

 Moore.] 



Common in marshes. Native. 



Southern United States and West 



Indies. Its nchenes probably reached 



Bermuda on the wind. Flowers from 



spring to autumn. 



