109 



heads several or numerous, 2' — 6 long, the involucre campanulate, 

 the receptacles chaffy; fertile heads mostly solitary, ovoid or ob- 

 ovoid, reticulated, shortpointed, unarmed, or with about 4 short 

 tubercles, pubescent, I /4 — ^2 long. 



In moist open soil. Illinois to the Northwest Territory, south to 

 Texas, Mexico and California. July-Oct." 



Deze beschrijving klopt volkomen met mijn planten, ook de af- 

 beelding komt goed overeen. Bij A. Gray 1. c. p. 828 vindt men: 



Fig. 4. Blad en vrucht van 

 A. artemisiaefolia. 



Fig. 5. Blad en vrucht van 

 A. psilosfachya. 



„Paniculately branched perennial (onderstreping van mij. K.) 

 5 — 15 d.M. high, with slender running rootstocks (id. K.) rough 

 and somewhat hoary with short stiff ish hairs ; leaves once pinna-" 

 tifid, thickish the lobes acute, those of the lower leaves often 

 incised; fruit obovoid pubescent, the tubercles absent or small. 

 Prairies and plains. 111. and Wise, to the Saskatchewan, westw. and 

 southwestw." Ik twijfelde dan ook geen oogenblik aan mijn deter- 

 minatie en was niet weinig verbaasd, toen ik de plant van Dr. 



