148 SYNGENESIA. SLPEEFLUA. 



hemispherical calix pubescent; stem 3 to 5-flo\vered, pe- 

 duncles axillar and terminal. Hab. On the plains of the 

 Missouri, (around Fort Mandan, abundant ) Flowering inr 

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

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

 4 lines wide, smooth; peduncles about 2 inches long, pu- 

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

 numerous. Seeds smooth; pappus double, exterior whiti&h, 

 interior short, simply pilose and rufescent. 



7. E.? beUidifolivm. 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 Aster. 8. 

 qnercifolium. -}-. 9. ptirpureum. 10. E.P compoeiium. Ph. 

 Some other genus! 



§ II. Stems paniculate or branclied. 



11. philadelphicum. Pappus double. 12. strigosum. 

 Pappus double. 13. heterophylhim. Rays without pap- 

 pus! pappus of the hermaphrodite florets double, the inner 

 of about 15 ra} s. 14. hyssopifolium. 15. lon^ifoUum. What 

 genus? 



*G^NOTUs. t Cc7/Lr oblong, in fruit reflected. 

 Mays of the flower very numerous and minute. 

 Recefitacle ud\^tdi. P a/i/i u s Yiilose, simple. 



Annual plants, divaricately branched; flowers very co- 

 pious and inconspicuous; radii composed of more than a 

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

 after the manner of Conyza and Gnaphalium; hermaphro- 

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

 persistent, the minute exterior pappus of Erigeron want- 

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

 cai florets inflated as in many species of Erigeron. 



16. canade?ise. Stem erect, hirsutely pilose, and much 

 branched, branches paniculate; leaves linear-lanceolate, 

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

 tending throughout North America and Euroj^e. 



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

 panicle nearly simple, peduncles almost naked, fihform 

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



I From x«<vo5, common^ or xulgar; C. canadensis, being one 

 of the most common of all weeds in North Americ;\. 



