154 



including every species collected on the Linnton area that was 

 capable of determination, I have tried to follow as far as possible 

 the order of families and genera as accepted in Gray's Manual, 

 and to use the nomenclature of the Vienna Code. The list 

 may be divided into three groups: (i) those that are indigenous 

 to the Pacific coast, and which have probably invaded the ballast- 

 ground from the surrounding territory, although in the case of 

 a few of them I strongly suspect they were brought in in ballast ; 



(2) those that, although introduced, are found elsewhere in 

 Oregon. Whether these were originally brought to Linnton in 

 ballast, or found their way in from the surrounding neighbor- 

 hood, cannot in most cases be determined with any certainty; 



(3) those that I have found only on the Linnton area. Some 

 of this last group will probably be transferred to group (2) by 

 other collectors; but as far as my own experience goes, I have 

 not found them at any other station. A few species that on 

 account of the immaturity of the specimens could not be deter- 

 mined with any certainty are added at the end. 



Group i. wSpecies Indigenous on the Pacific Coast 



1. Pteris aquilina L., var. pubescens Clutc. Our commonest fern — locally a bad 



weed. 



2. Equiselum arvense L. Common throughout. 



3. Phalaris arundinacea L. Not common in the Willamette Valley. 



4. Alopecurus arislulalus Michx. Not uncommon in wet places. 



5. Agrostiii alba L., var. maritima (Lam.) Mey. Common along the coast. 



6. Deschampsia elongala (Hook.) Munro. Very common. 



7. DisUchlis spicata (L.) Greene. Common along the coast. 



8. Poa Sandbergii Vasey. It is hard to explain the presence of this species. 



9. Poa triflora Gilib. As far as the Pacific coast is concerned, I suspect this 



should be regarded as introduced. 



10. Fesluca megaliira Nutt. Very common — appears as if introduced. 



11. Fesluca rubra L. Perhaps introduced here, but undoubtedly indigenous in 



many places. 



12. Bromus carinatus Hook. & Arn. Abundant. 



13. Hordeum jubatutn L. Probably introduced, but indigenous in other localities. 



14. Elymus glaucus Buckl. Very common. 



15. Rumex occidentalis Wats. Common near the coast. 



16. Spergularia rubra (L.) J. & C. Presl. 



17. Spergularia tnarina (L.) Griseb. Both perhaps introduced. 



18. Eschscholzia californica Cham. Very common. 



19. Lepidiutn apetalum. Willd. Common in the interior. 



20. Rubus macropeialui Dougl. An evident invasion from the neighborhood. 



