446 CARDUACEAE. 



wide, reticulate-veiny; clusters of heads compact, leafy-bracted ; involucre 5-6 

 mm. high, its bracts lanceolate, acute, viscid-puberulent. 



Marshy places, Great Bahama, Andres, New Providence, Eleuthera : southeast- 

 ern United States to Texas and North Mexico; Cuba. Perennial Mabsh Fi.eabane. 



3. Pluchea purpurascens (S\v.) DC. Prodr. 5: 452. 1836. 



Conyza purpurascens Sw. Prodr. 112. 1788. 



Herbaceous, annual; stems rather stout, finely pubescent at least above, 

 simple or branched, 3-12 dm. high. Leaves ovate to ovate-lanceolate, sparingly 

 finely pubescent or glabrate, dentate or crenate-dentate, acute or acuminate at 

 the apex, narrowed or obtuse at the base, 5-12 cm. long, the petioles 3 cm. 

 long or less, the upper ones smaller, nearly sessile; heads usually numerous; 

 involucre 4-5 mm. high, its bracts ovate to lanceolate, acute, pubescent; 

 flowers pink. 



Brackish swamps and borders of coppices, Great Bahama and Andros to For- 

 tune Island and Inagua : southeastern United States ; Bermuda ; West Indies, south 

 to Guadeloupe : Mexico and Central America. Reported by Mrs. Northrop as P. cam- 

 phorata DC. to which it is closely related. Annual Mabsh Fleabane. 



13. SACHSIA Griseb. Cat. PI. Cub. 150. 1866. 



Perennial seapose herbs, with tufted basal serrate leaves and loosely 

 corymbose or panicled small heads of tubular and radiate flowers, the rays 

 white. Involucre campanulate, its bracts imbricated in several series, acute, 

 rigid, the outer successively smaller. Receptacle naked, flat or convex. Ray- 

 flowers fertile, with filiform 2-3-toothed corollas; disk-flowers tubular, regu- 

 lar, fertile, or the inner sterile. Achenes compressed, 4-5-angled; pappus a 

 single series of capillary barbed bristles. [In honor of F. G. J. von Sachs, 

 German plant physiologist.] Four known species of Cuba, Florida and the 

 Bahamas. Type species: Sachsia polycephala Griseb. 



1. Sachsia bahamensis Urban, Symb. Ant. 3: 408. 1903. 



Scape slender, erect, villous at the base, rough-glandular above, bearing 

 2-5 very small and distant leaves. Basal leaves several, spatulate to oblong- 

 obovate, firm in texture, 7 cm. long or less, obtuse at the apex, narrowed at 

 the base into short petioles, repand-dentate, minutely glandular and sparingly 

 pubescent beneath; inflorescence loosely corymbose-paniculate; peduncles slen- 

 der, mostly longer than the heads; involucre about 7 mm. high, its bracts in 

 about 6 series, the outer ovate to lanceolate, densely glandular, the inner nar- 

 rowly linear; outer flowers in several series, their filiform corollas 3-toothed; 

 achenes linear, striate, about 2 mm. long; short-pilose; pappus yellowish-white, 

 about 4 mm. long. 



Pine-lands and savannas of Great Bahama, Andros and New Providence : 

 Florida. Bahama Sachsia. 



14. TETRANTHUS Sw. Prodr. 116. 1788. 



Small prostrate herbs, with opposite petioled leaves, and very small discoid 

 heads solitary and peduncled in the axils, usually 4-flowered, with 2 flowers 

 fertile and 2 sterile. Bracts of the involucre 4, sometimes with 4 minute ex- 

 terior ones. Receptacle naked. Corolla tubular with a somewhat campanulate 

 5-lobed limb. Anthers obtuse. Achenes oblong, angled or striate; pappus 

 short, crown-like. [Greek, four-flowered.] Four known species, natives of 

 the West Indies. Type species: Tetranthus littoralis Sw. 



