SYNGENESIA. .ECtUALIS. 135 



Pappus plumose. Seed pubescent, multistri- 

 ate. 



Habit similar to EupatoHum. Leaves alternate; flowers 

 ochroleucous. 



Species. 1. K. exiimtorioides. 2. Critonia. On the banks 

 of the Schuylkill, near Vhiladelphia, but rare. Obs. Leaves 

 punctate and .yflandular on the underside. Seed numer- 

 ously striate, cylindric, with a corneous cicatrice at the 

 base, and connected to the smooth receptacle by a minute 

 stipe, inte.i;'ument valvular, 10-parted; pappus consisting 

 of about 24 rays. — The only species of the genus. 



542. EUPATORIUM. L. 



Calix simple or imbricate, oblon.s;. Stijle long 

 an'l semibiMd. ficcejj^ac/e naked. Pappzts pilose, 

 or morf^ commonly scabrous. Seed smooth and 

 glaniiJilar, quinquestriate. 



Shrubby or herbaceous; leaves mostly opposite, in a few 

 species verticillate or alternate, generally entire, seldom 

 trifid, pinnatifid or pseudopmnate; flowers mostly corym- 

 bose, very rarely paniculate; calix 3 to 5, 6 to 12 or more 

 than 20-flovvered, colour of tiie flower purple, or white, 

 rarely blue, (as in E. calesthium.) — Tiitegument of the seed 

 smooth, but glandular, separable constantly into 5 minute 

 valves, the angles connected by 5 fibrous ligatures, which 

 are also common to many other genera. In many of the 

 species, (and in all more or less apparent), there is a cir- 

 cular cicatrice at the base of the seed, surrounding a mi- 

 nute stipe, by which the seed is attached to the recep- 

 tacle. 



Species. 1. E. fesniculacewn. 2- soronopifolium. Flow- 

 ers in both these species paniculate, in 2 the leaves are 

 pinnatifid, and in No 1, pseudopinnate and filiform. They 

 possess the habit of Astemiday but the calix and seeds of 

 this genus, from which they appear inseparable. 3. Amo- 

 pifoUum, Pluk. Amalth. t. 395. f. 6. 4. linearifolium. Leaves 

 nearly entire. 5. sessiUfolium. 6- truncaUim. 7- album. 

 Indigenous also to Japan. 8. laiiceohitum. 9. teacrifoUum. 

 10. cuneifoUum. 11. melissoides. 12. rotundifoUum. 13. 

 pubescem. 14. ceanothifolium. 15. altissitnutn. 16. amoc 

 7:um. Vh- 17. trifoliatum. 18. falcatmn. 19. purpureum, 

 Obs. Stem smooth and glaucous, fistulous. 20. maculatum. 

 21. punctatunu A mere variety of the following? 22. -wer- 

 ticillatum. 23. perfoUaUim. 24. coslestinum. Calix from 

 30 to 40-flo\vered. 25. aromaticum. 26. a^^eratoides. 27' 

 serotinum. 



