disturbed by building operations. Since most of these species 

 occur rarely or not at ajl elsewhere in Western Oregon, a list of 

 those that appear most likely to persist is herewith presented : 



1. Bromiis hrizaeformis Fisch. & Mey. Not uncommon east 

 of the Cascades, but apparently not elsewhere established in the 

 Willamette Valley. 



2. Ammophila arenaria (L.) Link. This maritime grass is 

 specially adapted to situations of this type, and will be most 

 difficult to eradicate on account of its long tough rootstocks. 



3. Urtica dioica L. This has been given a wide berth on 

 account of its stinging properties, and occupies a considerable 

 area along one side of the "cradle." 



4. Roiibieva mtdtifida (L.) Moq. Prostrate on the sand. This 

 also occurs in the railroad-yards in Lower Albina, some four 

 miles up the Willamette and on the opposite bank, where ballast 

 also seems to have been deposited in the early days. 



5. Lepidium Draba L. This is rarely found on vacant lots 

 elsewhere about Portland . 



6. Brassica incana Tenore. Very persistent over the entire 

 area. 



7. Diplotaxis tenuifolia (L.) DC. This also occurs at Lower 

 Albina. 



8. Reseda lutea L. Only a few plants, but persistently reap- 

 pearing each year. 



9. Reseda Luteola L. Also at Lower Albina. 



ID, Lotus corniculakis L. This varies greatly in frequency in 

 successive years, but has never entirely disappeared. 



11. Medicago minima L. Covering the ground in dense mats 

 of considerable extent. 



12. Ulex europaeus L. Two or three vigorous specimens have 

 persisted. A few isolated plants occur elsewhere in Western 

 Oregon, but it does not show the disposition to spread which is 

 manifested by its near relative, Cytisus scoparius (L.) Link. 



13. Melilotus officinalis. (L.) Lam. This seems to flourish 

 exceptionally well on the ballast, reaching a height of 7-10 feet 

 even in dry gravel. 



14. Melilotus indica (L.) All. During the last year this has 

 been reported from several other stations, and seems to be 

 coming in from the southward. 



