This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
V. Baldwinii Torr. Ann. Lyc. N. Y. 2: 211. 1827.
Cacalia Baldwinii Kuntze, Rev. Gen. Pl. 969. 1891.
Vernonia interior Small, Bull. Torr. Club 27: 279. 1900.
V. interior Baldwinii Mack. & Bush, Fl. Jackson Co. 190. 1903- Stout, 2°-51/2° high, finely and densely tomen tose-pubescent. Leaves lanceolate or oblong-lanceolate, acuminate or acute at the apex, sharply serrate, 4'-8' long, 1/2'-2* wide, scabrate above, densely tomentulose beneath; heads stout-pedun-cled, 15-30-flowered; involucre hemispheric, 3"-4" broad; bracts ovate, the acute tips recurved or spreading; pappus purple.
In dry soil, Iowa to Missouri, Nebraska, Kansas and Texas. July-Sept.
1894. V. illinoensis Gleason, Bull. N. Y. Bot.
Gard. 4: 211. 1906.
Stout, densely tomentose, 3°-5° high. Leaves lanceolate to narrowly oblong, acuminate, finely serrate, 3'-6' long, 1/2'-1 1/2' wide, scabrous above, densely pubescent beneath; inflorescence usually compact; heads short-peduncled; involucre hemispheric or short-cylindric, 2"-6" in diameter, 30-60-flowered; bracts purplish, appressed, ovate, obtuse, acute, or mucronate, more or less floccose-pubescent or ciliate; achenes glabrous or a little pubescent; pappus purplish to tawny.
Prairies, Ontario and Ohio to Illinois, Kentucky, Missouri and Texas. Autumn.