302 



COMPOSITAE. 



[Vol. III. 



mtUtBU. 



.-s^fU^})^^^^.,^ 



Bracts of the involucre wholly appressed. 



Leaves glabrous or very nearly so on both surfaces. 



Leaves thin, pale beneath, the lower oval, coarsely serrate. 4. V. glauca. 



Leaves thin, green beneath, lanceolate, finely serrate. 5. V. giganlea. 



Leaves thick, narrowly lanceolate, finely serrate. 6. V.fasciculala. 



Leaves densely lomentose-pubescent beneath, lanceolate. 7. V. Drummondii. 



Leaves narrowly linear, inerved, 2"-^' wide, dentate. 8. V. marginala. 



I. Vernonia Noveboracensis (L.) 



Willd. New York Iron-weed. Flat 



Top. (Fig. 3601.) 



Serrahila Xoz-eboraccnsis L. Sp. PI. SiS. 1753. 

 /'. Xoz'ebo>ace)isisV,'\\\&. Sp. PI. 3: 1632. 1S04. 

 C. Noz'ehoraceiisis Kuntze, Rev. Gen. PI. 323. 1891. 

 Roughisli pubescent or glabrate, 3°-9° high. 

 Leaves lanceolate or narrowlj' oblong, serrulate, 

 3'-io' long, 5"-i2" wide, acuminate or acute 

 at the apex; heads peduncled; involucre hemis- 

 pheric, 20-3o-flowered,4"-5" in diameter; bracts 

 brownish-purple, ovate or ovate-lanceolate, tipped 

 with subulate spreading awns usually of twice or 

 three times their own length, or some of the lower 

 linear subulate, the upper sometimes merely 

 acute; flowers deep purple, rarely white; achenes 

 hispidulous on (he ribs. 



In moist soil, M.-issachusctts to Minnesota, south 

 to Georgia and Missouri. July-Sept. 

 Vemonia Noveboracensis tomentosa (Walt.) Britten, 



Mem. Torr. Club, 5: 311. 1S94. 

 Chrysocoma tomenlosa Walt. Fl. Car. 196. 1788. 

 Leaves densely puberulent beneath, broader; involucre purple, some scales sometimes merely 

 acute. In dry soil, Virginia to North Carolina. 



2. Vernonia crinita Raf. Great 

 Iron-weed. (Fig. 3602.) 



V. crinita Raf. New Flora N. A. 4: 77. 1836. 



Vernonia Arkansana DC. Prodr. 7: 264. 1838. 

 C. Arkansana Kuntze, Rev. Gen. PI. 969. iSgt. 

 Stout, glabrate or finely rough-pubescent, 

 S°-:2° high. Leaves narrowly lanceolate, 

 finely denticulate, acuminate, 4'-i2' long, 3"- 

 12" wide; heads stout-peduncled, the pedun- 

 cles thickened above; involucre hemispheric, 

 9"-i2" broad, so-yo-flowered; bracts green, 

 or the upper reddish, very squarrose, all filiform- 

 subulate from a broader base and equalling the 

 head, the inner ones somewhat wider below; 

 achenes hispidulous on the ribs. 



On prairies and along streams, Missouri to 

 Texas. Aug.-OL-t, 



3. Vernonia Baldwinii Torr. Bald- 

 win'.s Iron-weed. (Fig. 3603.) 



V. lialdzriniitoxT. Ann. Lye. N. Y. 2; 211. 1827- 

 Cacalia Baldutnii Kuntze, Rev. Gen. PI. 969 



1891. 



Stout, 2°-5>^° high, finely and densely to- 

 nientose-pubescent. Leaves lanceolate or ob- 

 long-lanceolate, acuminate or acute at the 

 apex, sharply serrate, 4'-S' long, yz'-2' wide, 

 scabrate above, densely tomentulose beneath; 

 heads stout-peduncled, i5-30-flo\vered; invo- 

 lucre hemispheric, 3"-4" broad; bracts ovate, 

 the acute tips recur\-ed or spreading. 



In dry soil, Missouri and Nebraska to Texas. 

 July-Sept. 



