348 SXXGEXESIA. SrPERFLUA. 



hemispherieal calix pubescent; stem 3 to 5-flowerecl, pfi= 

 duncles axillar and ierminal. Hab. On the plains of ihe 

 Missouri, (around Fort Mandan, abundant ) Flowering in 

 August. Stem 12 to 18 inches high, simple, smooth be- 

 low; lower leaves of the stem much attenuated belov, 3 or 

 4 lines wide, smooth; pedimcles about 2 inches lone, pu- 

 bescent; flower the size of a Daisy, pale blue; rays very 

 numerous. Seeds smooth; pappus double, exterior whitish. 

 Interior short, simply pilose and rufcsceiit. 



7. E.? belli difolhmi. Canescently hirsute; radical leaves 

 obovate, subserrate, stem leaves remote, oblong-ovate, 

 amplexicaule, entire; stem 3 to 5-flowered; radii nearly 

 twice the length of the hemispherical calix. Hab. From 

 Canada to Virginia, and on the mountains of Carolina; 

 common.—PerenniaL Flower usually large, blueish. Pap- 

 pus si7nple, of about 30 raj s. Nearly allied to .Isier. 8. 

 miercifolhim. -\-. 9. piirpureum. 10. E.? copipositum. Ph. 

 Some other genus? 



§ 1 1. .Sfe?ns panindate or hvanched. 



11. philadelphicum. Pappus double. 12. atrigosum. 

 Pappus double. 13. heterophyllum. Rays without pap-» 

 pus! pappus of the hermaphrodite florets double, the inner 

 of about 15 rays. 14. /ii/ssopi/oliim. 15. lon^ifolium. What 

 genuis? 



*CiENOTus. t Co //jc oblong, in fruit reflected. 

 Hays of the flower very numerous and minute. 

 Recefitacle naked. Pafifius pilose, simple. 



Annual plants, divaricately branched; flowers very co- 

 pious and inconspicuous; radii composed of more than a 

 simple series, more nymerous than the florets of the disk, 

 after the manner of Conyza and Gnaphalimn,- hermaphro- 

 dite florets mostly 4-cleft; pappus pilose, of 12 to 15 rays,, 

 persistent, the minute exterior pappus of Erigeroii want- 

 ing; seed oblong, compressed, 2-edged. Tube of the dis- 

 Cal florets inflated as in many species of Erigeron. 



16. tanadense. Stem erect* hirsutely pilose, and much 

 branched, branches paniculate; leaves linear-lanceolate, 

 ciliate; radical toothed. Had. A most common weed, ex- 

 tending throughout North America and Europe. 



17. * pusilhcn. Erect, low and slender; stem smooth; 

 panicle nearly simple, peduncles almost naked, filiform 

 and divaricate; leaves lanceolate-linear, all entire, margin 



f From xe/voc, comnicn, or ttdgar; C. canadensis, being one 

 of the- most c«mmoTi of all weeds in North America. 



