Genus i.] 



THISTLE FAMILY. 



303 



4. Vernonia glauca (L,. ) Britton. 



Broad-leaved Iron-weed. 



(Fig. 3604.) 



Serratula glauca L. Sp. PI. 818. 1753. 



Vernonia Noveboracensis var. latifolia A. 

 Gray, Syn. Fl. 1: Part 2, 89. 1884. 



Vernonia glauca Britton, Mem. Torr. Club, 

 5: 311. 1894. 



Slender, glabrous or finely puberulent, 

 2-5 high. Leaves thin, the lower broadly 

 oval or slightly obovate, sharply serrate, 

 acute or acuminate, A'~l' long. I'-sK' 

 wide, the upper narrower and more finely 

 toothed; inflorescence loosely branched; 

 heads slender- peduncled, 10-20-flowered; 

 involucre campanulate, 2 // -3^ // 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. Aug.- 

 Sept. 



6. Vernonia fasciculata Michx. 

 Western Iron-weed. (Fig. 3606.) 



Vernonia fasciculata Michx. Fl. Bor. Am. 

 2: 94. 1803. 



Cacalia fasciculata Kuntze, Rev. Gen. PI. 

 970. 1 89 1. 



Glabrous, or puberulent above, 2-6 

 high. Leaves firm, lanceolate or linear- 

 lanceolate, long-acuminate, 3 / -6 / long, 2 // 

 -I5 // 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 altissima Nutt. Gen. 2: 134. 1818. 

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



1891. 

 Vernonia gigantea Britton; Kearney, Bull. 



Torr. Club, 20: 485. 1893. 



Glabrous or nearly so, 5-io high. 

 Leaves thin, lanceolate, sometimes broadly 

 so, usually long-acuminate, finely serrate, 

 4/-1 2 / long, %'-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"-^" 

 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. 



if 



