SYNGENESIA. .E^UALIS. 135 



Pajypus plumose. Seed pubescent, multistrl- 

 ate. 



Habit similar to Eupatorium. Leaves alternate; flowers 

 ochroleucous. 



Species. 1. K. eupator-ioides. 2. Critonia. On the banks 

 of the Scluiylkill, near Philadelphia, but rare. Obs. Leaves 

 punctate and prlandular on the underside. Seed numer- 

 ously striate, cyliudric, with a corneous cicatrice at the 

 base, and connected to the smooth receptacle by a minute 

 stipe, inte:;^ument valvular, lO-parted; pappus consisting 

 of about 24 rays. — Tiie only species of the g"enus. 



542. EUPATORIUM. L. 



Calix simple or imbricate, oIjIoiii?. Style long 

 and semibitid. Receptacle naked. Pappus pilose, 

 or more commonly scabrous. Seed smootii and 

 glandular, quinquestriate. 



Shrubby or herbaceous; leaves mostly opposite, in a few 

 species verticillate or alternate, generally entire, seldom 

 trifid, pinnatifid or pseudopinnate; flowers mostly corym- 

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

 than 20-flowered, colour of the flower purple, or white, 

 rarely blue, (as in E. ca:Iestmum.)-~ln\.egnmcnt oi' lUe seed 

 smooth, but glandular, separable constantly into 5 minute 

 valves, the angles connected by 5 fibrous ligatures, whicU 

 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. ISt. fatiicidaceum. ^. coronopi folium. Flow- 

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

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

 possess the habit o^ Astemisia^ but the calix and seeds of 

 this genus, from which they a]ipear inseparable. 3. hhso' 

 /«/e/i?/?,>j, Pluk. Amalth. t. 395. f. 6. 4. uneari/ulium. Leaves 

 nearly entire. 5. sessilifolium. 6- tnmcatiim. 7 • album. 

 Indigenous also to Japan, 8. la^iceoJatum. 9. teacrifoUum. 

 10. cuneifolium. 11. me'dssoides. 12. rotundlfolium. 13. 

 pubescens. 14. ceanothifolium. 15. altlssimum. 16. amoe- 

 num. Ph- 17- trifolintinn. IS. falcaiian. 19. purpureum. 

 Obs. Stem smooth and glaucoiis, HstulouS. 20. maculatum. 

 21. ptinctaium. A mere variety of the following? 22. ver- 

 ticillahi>n. 23. perf<jlintum. 24. ccelestinum. Calix from 

 30 to 40-flowered. 25. aro.rMtiaim. 26. ajeratoides. 27- 

 serotinum. 



