[Vol. 2 



606 ANNALS OP THE MISSOURI BOTANICAL GARDEN 



8. carolinianus Spreng. Syst. 3 : 559. 1826. 



S. densiflorus Martens, Bull. Acad. Roy. Soc. Brux. 8 : 66 



1841 



8. Schiveinitzianus Nutt. Trans. Am. Phil. Soc. 7 : 413. 



1841. 



Annual or biennial, glabrous or slightly tomentulose in the 

 axils of the leaves; stems erect 1 to 10 dm. high, striate; 

 radical leaves petiolate, lyrate, occasionally undivided ; those 

 of the stem petiolate or sessile and semiamplexicaul, pin- 

 nately divided into rather remote, narrowly cuneate to sub- 

 reniform unequal divisions; inflorescence a terminal corym- 

 bose cyme; heads 6 to 8 mm. high, radiate; ray-flowers 8 to 

 12; disk-flowers about 50; achenes usually hirtellous- 

 puberulent. 



Distribution: North Carolina west to Illinois, Missouri, 

 and South Dakota, south to Florida and eastern Texas. Com- 

 mon on river bottoms and flood-plains. 



Specimens examined : 



North Carolina : near Wilmington, April, 1888, McCarthy 

 (U. S. Nat. Herb.) ; without locality, Curtis (Gray Herb.). 



South Carolina: Goose Creek, 19 May, 1885, A. C. & F. W. 

 Maier (Gray Herb.) ; swamps, Summerville, April, 1890, 

 Taylor (Field Mus. Herb.). 



Georgia: Macon, coll. of 1875, Curtiss (U. S. Nat. Herb.) ; 

 central Georgia, coll. of 1846, Porter (Gray Herb.); Butler 

 Island, Mcintosh Co., 27 May, 1909, Smith 2185 (Field Mus. 

 Herb.). 



Florida: without locality, Chapman (Gray Herb., U. S. 

 Nat. Herb., and Kew Herb.); Fort Orange, 10 April, 1895, 

 Straub 103 (Gray Herb.) ; near Chattahooche, Curtis 1565 

 (Gray Herb., U. S. Nat. Herb., Kew Herb., and Field Mus. 

 Herb.) ; River Junction, 19 April, 1898, Curtis 6370 (U. S. 

 Nat. Herb, and Mo. Bot. Gard. Herb.) ; Sand Point, 8 April, 

 1874, Palmer 301 (Gray Herb., U. S. Nat. Herb., and Mo. Bot. 

 Gard. Herb.) ; near St. Marks, coll. of 1843, Rug el (Mo. Bot. 

 Gard. Herb., and Kew Herb.); Losman's Key, May, 1891, 

 Simpson 154 (U. S. Nat. Herb, and Field Mus. Herb.); New 



