27 



2g. Ilysaiithcs inacqiialis (Walt.) Pennell. On muddy shores of 

 the Willamette River, Salem. Perhaps has been mistaken 

 for /. diihia (L.) Barnh. 



30. *Orobaiichc iiiiiwr Sm. In shipyard on old ballast. Linnton, 



.Portland. 



31. *Ritbia tiiictontni L. On street-parking, Salem. Nowhere 



found in cultivation. 



^2. *Lonicera Xylosteiun L. Along railroad-track at Mute 

 School, Salem. 



^T,. ^Solidago scrotina Ait. var. gigantca (Ait.) Gray. W'aste 

 ground at old city dump, Salem. A native of the eastern 

 U. S., and frequent here in cultivation. 



34. *Cciifaiirca Jacea L. var. laccra Koch. Dry roadside in river- 

 bottom near Orville, ^Marion Co. 



I am again under obligation to ^Ir. J. F. ^lacbride for his un- 

 wearying kindness in verifying and correcting these determina- 

 tions. Specimens of all the above have been deposited in the 

 Gray Herbarium, and also in the herbarium of the Philadelphia 

 Academy of Science (naturalized species only). 



Mr. S. B. Parish's exhaustive study of the Immigrant Plants 

 of Southern California (Bull. S. Cal. Acad. Sci. 19: Part 4, 3-30. 

 Oct. 1920) afifords an interesting contrast between the weed- 

 floras of the two neighboring States. He includes in his list 290 

 species, and appears to have thoroughly covered his territory ; 

 w'hereas in \\'estern Oregon north of the Umpqua Valley some- 

 thing over 450 introduced species have been reported — and the 

 end is not yet ! While the w^armer winters of Southern Cali- 

 fornia permit a number of sub-tropical species to gain a foot- 

 hold that would be unable to survive in Oregon, this advantage 

 is more than offset by the greater aridity of the Calif ornian sum- 

 mer. The climate of W'estern Oregon is in this respect more 

 nearly like that of Western Europe, and the immigrants from 

 that very weedy region therefore find summer conditions more 

 favorable here than further south, while they escape the severe 

 winters of the Atlantic seaboard. If our Oregon rainfall could be 

 distributed so as to give us a few more inches of precipitation in 



