Gents i.] 



THISTLE FAMILY. 



4. Vernonia glauca (L. ) Britton. 



Broad-leaved Iron-weed. 



(Fig. 3604.) 



Seiralida glauca L. Sp. PI. 81S. 1753. 

 yernonia Ntn'eboracensis var. lali/olia .\. 



Gray, Syn. Fl. i: Part 2, Sq. 1884. 

 Vernonia glauca Britton, lleni. Torr. Club, 



5: 311. 1894. 



Slender, glabrous or finely puherulent, 

 2°-5° high. Leaves thin, the lower broadly 

 oval or slightly obovate, sharply serrate, 

 acute or acuminate, 4'-7' long, i'-2j4' 

 wide, the upper narrower and more finely 

 toothed; inflorescence loosely branched; 

 heads slenderpeduncled, io-20-flowered; 

 involucre campanulate, ^''-^Yz" broad; 

 bracts ovate, acute, or mucronate, or the 

 upper ones obtuse, all appressed; achenes 

 minutely hispidulous. 



In woods, Pennsylvania and Maryland to 

 Ohio, south to Florida and Louisiana. .A.ug.- 

 Sept, 



6. Vernonia fasciculata Michx. 

 Western Iron-weed. (Fig. 3606.) 



Vernonia fasciculata Mich.\. Fl. Bor. .\m. 



2: 94. 1803. 

 Cacalia fasciculata Kuntze, Rev. Gen. PI. 



970. 1891. 



Glabrous, or puberulent above, 2°-6° 

 high. Leaves firm, lanceolate or linear- 

 lanceolate, long-acuminate, 3'-6' long, 2" 

 -15" wide, glabrous or nearly so on both 

 surfaces; inflorescence usually compact; 

 heads short -peduncled, or some of them ses- 

 sile; involucre campanulate, 2"-3" broad, 

 20-30-flowered; bracts all appressed, ovate 

 or oval, acute, ciliate, or sometimes pubes- 

 cent; achenes glabrous, or a little pubes- 

 cent. 



In moist soil or on prairies, Ohio to Minne- 

 sota and Dakota, south to Kentucky and 

 Texas. July-Sept. 



5. Vernonia gigantea (Walt.) 



Britton. Tall Iron- weed. 



(Fig. 3605.) 



Chrysocoma gigantea Walt. Fl. Car. 196. 1788. 

 Vernonia attissima Null. Gen, 2: 134. 1818. 

 Cacalia gigantea Kuntze, Rev. Gen. PI. 324. 



1891. 

 Vernonia zigantea Britton; Kearney, Bull. 



Torr. Cliib, 20: 485. 1893. 



Glabrous or nearly so, 5°-io° high. 

 Leaves thin, lanceolate, sometimes broadly 

 so, usually long-acuminate, finely serrate, 

 4'-i2' long, >2'-i Yz' wide, usually glabrous 

 on both surfaces; inflorescence at length 

 loosely branched and open; heads short- 

 peduncled or some of them sessile; invo- 

 lucre campanulate or turbinate, 2"-3" 

 broad, 15-30- flowered; bracts obtuse or 

 mucronate, more or less ciliate, appressed; 

 achenes slightly hispidulous. 



In moist soil, Pennsylvania to Florida, 

 west to Illinois, Kentucky and Louisiana. 

 July-Sept. 



