Lange: REVEGETATION OF TRESTLE ISLAND. 627 



19. Water pepper (Polygonum hydropiper). 



20. Climbing false buckwheat {Polygonum scandens). 



21. Lamb's quarter (Chenopodinm sp.). 



22. Dock (Rtimex sp.). 



23. Giant sunflower (Helianthns giganteus). 

 i\. Black-eyed Susan {Rndbcckia htrta). 



25. Common thoroughwort (Eupatorhim pcrfo liatu m). 



26. Late goldenrod (Solidago seroti.no). 



27. Canada goldenrod {Solidago canadensis}. 



28. Prairie mugwort {Artemisia gnaphaloides}. 



29. Bushy aster (Aster dumosus}. Identified from leaves only. 



30. Red clover (Trifolium pratcnse], 



31. Peppergrass (I^epidium sp.). 



32. Tall sisymbrium (Sisymbrium altissimutri). 



33. Black mustard (Brassica nigrd]. 



34. Black nightshade (Solanum nigruni). 



35. Bristly buttercup (Ranunculus pennsylvanicus). 



36. Swamp willow-herb (Epilobium palustre). 



37. Common evening primrose (Onagra biennis). 



38. Canada thistle (Carduus arvensis). 



39. Common thistle (Cardutts Janceolattis}. 



40. Water hemlock (Cictita maculata). 



41. Nodding wild rye (Elymus canadensis]. 



42. Squirrel-tail grass (Hordeum jubatum}. 



43. Grass sp. 



44. Grass sp. 



45. Grass sp. 



46. Grass sp. 



47. Sedge (Cyperus sp.). 



THE SEASON OF 1900. 



The last half of October, 1899, was <l u i te ^T an d at the end 

 of the month the United States Weather Bureau reported an 

 accumulated deficiency in precipitation since January first of .73 

 inch. On some day between October 29 and November 4, 

 1899, a prominent factor in plant distribution appeared on the 

 East section of Trestle island. Fire changed the wilderness 

 of dead, dry weeds into a black, ashy waste. 



On May 6, 1900, the East section looked, on the whole, still 

 barren and black. All the over-ground parts of the young 



