436 CABDUACEAE. 



3. Vernonia bahamensis Griseb. Fl. Br. W. I. 352. 1861. 



A shrub, 0.52 m. high, dichotomously branched, the twigs and leaves 

 pale-tomentulose. Young twigs angled; leaves spatulate to elliptic, 1.5-5 cm. 

 long, entire, obtuse, mucronate or retuse at the apex, narrowed into slender 

 petioles 5-10 mm. long; heads few, sessile on the twigs among the upper 

 leaves, 7-13 -flowered; involucre campanulate, 3-4 mm. long, its bracts ovate- 

 lanceolate, acute, tomentose, imbricated in few series; achenes hirsute, 2-2.5 

 mm. long ; pappus nearly white, 4-5 mm. long. 



Scrub-lands, rocky plains and white-Lands, Crooked Island,* Fortune Island, 

 Acklin's Island, Castle Island, Mariguana, Caicos Islands, Cotton Cay and Salt Cay, 

 Turk's Islands and Inagua. Endemic. BAHAMA VERNONIA. 



4. Vernonia insularis Gleason, Bull. Torr. Club 33: 184. 1906. 



Perennial by a horizontal rootstock; stem erect, glabrous, or puberulent 

 above, 1 m. high or less, simple or little-branched. Leaves narrowly linear- 

 oblong, 6-10 cm. long, 8-12 mm. wide, entire, glabrous or very nearly so, 

 acutish or obtuse and mucronate at the apex, narrowed to the sessile base; 

 heads 4-25, cymose, the peduncles 4 cm. long or less; involucre about 5 mm. 

 high, its bracts glabrous, acuminate, the outer lanceolate, the inner oblong; 

 achenes 2 mm. long, striate; pappus tawny, 6 mm. long, the outer bristles 

 minute. 



Pine-lands of Great Bahama and Abaco. Endemic. LONG-LEAVED VERNONIA. 



5. Vernonia cinerea (L.) Less. Linnaea 4: 291. 1829. 



Conyza cinerea L, Sp. PI. 862. 1753. 



Annual, simple or little-brar.ched, erect, 3-10 dm. high, appressed-pubes- 

 eent, leafy nearly to the base. Leaves flaccid, ovate to lanceolate, repand or 

 entire, acute or obtuse, the lower petioled, 4-7 cm. long, the upper much 

 smaller and sessile; heads numerous, slender-peduncled, in terminal compound 

 leafless cymes; involucre about 3.5 mm. high, its bracts narrowly lanceolate, 

 sharply acuminate, pubescent, the outermost minute; flowers purple; achenes 

 pubescent; pappus white. 



"Waste and cultivated grounds, New Providence and North Caicos : Florida, 

 West Indies and continental tropical America ; Old World tropics. HERBACEOUS 

 VERNONIA. 



2. AGEBATTJM L. Sp. PI. 839. 1753. 



Annual or perennial herbs, or shrubs, with mostly toothed leaves, the 

 small heads in terminal corymbs or cymes, the flowers all tubular. Involucre 

 campanulate or subhemispheric, its narrow bracts nearly equal, imbricated in 

 2 or 3 series, sometimes with 1-$ smaller outer ones. Eeceptacle flat to conic. 

 Corolla 5-toothed, white, blue, violet or purple. Anthers linear to oblong. 

 Achenes 5-angled. Pappus of awned or awnless scales, distinct or connate. 

 [Greek name of some similar plant.] About 25 species, mostly of tropical 

 distribution. Type species: Ageratum conyzoides L. 



1. Ageratum latifolium Cav. Icon. 4: 33. pi 357. 1797. 

 Ageratum muticum Griseb. Fl. Br. W. I. 356. 1861. 



Loosely villous or pubescent, erect or ascending, annual, simple or branched, 

 1-6 dm. high. Leaves ovate, membranous, 2-5 cm. long, crenate-dentate, 



* Hitchcock's reference to the species on Cat Island is, apparently, an error, 

 his label reads " Crooked Island." 



