CARDUACEAE. 445 



3. Baccharis dioica Vahl, Symb. 3: 98, 1794. 



Baccharis Valilii DC. Prodr. 5: 411. 1836. 



GlabrouS; branched, 2 m. high or less, shrubby, somewhat glutinous, the 

 twigs striate, densely leafy, sometimes- granular. Leaves obovate or cuncate- 

 obovate, 2-4 cm. long, 1-2 cm. wide, obtuse or subtruncate and mucronulate 

 at the apex, narrowed at the base into short petioles, the midvein rather promi- 

 nent, the lateral venation obscure; heads clustered at the ends of the twigs: 

 involucre 4-7 mm. high, its bracts oblong, imbricated in 4 or 5 series; pappus 

 of the pistillate heads about as long as the corollas; achenes 10-ribbed, 

 glabrous. 



Scrub-lands and coppices, Great Bahama, Abaco, Andros, New Providence, 

 Eleuthera, Cat Island, Inagua : — Florida ; Cuba ; Hispaniola ; St. Croix ; Montserrat ; 

 Jamaica. Vahl's Grouxdsel-bush. Broom-bush. 



12. PLUCHEA Cass. Bull. Soc. Philom. 1817: 31. 1817. 



Pubescent or glabrous herbs, or some tropical species shrubby, with 

 alternate dentate leaves, and small heads of tubular flowers in terminal 

 corymbose cymes. Involucre ovoid, campanulate, or nearly hemispheric, its 

 bracts appressed, herbaceous, imbricated in several series. Receptacle flat, 

 naked. Outer flowers of the head pistillate, their corollas filiform, 3-cleft or 

 dentate at the apex. Central 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 undivided. Achenes 4-5-angled. Pappus a single 

 series of capillary scabrous bristles. [Named for the Abbe N. A. Pluche, of 

 Paris.] About 35 species, widely distributed in warm and temperate regions. 

 Type species: Conyza marilandica Michx. 



Plants shrubby. 1, P. oclorata. 

 Plants herbaceous. 



Perennial ; leaves sessile. 2. P. foetida. 



Annual ; leaves petioled. 3. P. purpurascens. 



1. Pluchea odorata (L.) Cass. Diet. Sci. Xat. 4: 3. 1826. 



Conyza odorata L. Syst. ed. 10, 1213. 1759. 



A densely and finely pubescent shrub, up to 3 m. high. Leaves oblong, 

 entire, or undulate-serrate with small blunt teeth, 8-20 cm. long, 1.5-5 cm. 

 wide, rather dark green, loosely pubescent, becoming nearly glabrous above, 

 finely and densely pubescent and pale beneath, acute or acuminate at the apex, 

 narrowed at the base, the petioles 1-4 cm. long; corymbs mostly large; 

 peduncles and involucre densely pubescent ; involucre about 5 mm. high, its 

 bracts ovate to lanceolate, acute to acuminate; flowers creamy pink or whitish. 



Rocky scrub-lands, coppices and clearings throughout the archipelago from 

 Great Bahama and Andros to Grand Turlv and Inagua : — 'Bermuda ; Florida : West 

 Indies; Mexico to northern South America. Bushy Flbabane. Wild Tobacco. 

 Sour-bush. Cough-bush. 



2. Pluchea foetida (L.) B.S.P. Prelim. Cat. N. Y. 28. 1888. 



Baccharis foetida L. Sp. PI. 861. 1753. 

 Pluchea hifrons DC. Prod. 5: 451. 1836. 



Perennial ; stem simple or sparingly branched at the summit, puberulent 

 and slightly viscid, 4-9 dm. high. Leaves oblong, ovate or ovate-lanceolate, 

 sharply denticulate, sessile, pubescent or puberulent, 5-10 cm. long, 1-4 em. 



