48 Mnhlenbergia, Volume 7 



he suggests that it is of quite limited range, and this is probably 

 true. The type specimens were collected at Wolcott, Eagle 

 county, Colorado, July 11, 1902. The locality is north of the 

 Eagle river, on the rather steep mountain side which borders 

 the river. The soil is light and loose, gray in color, made from 

 a crumbling shale. Above and below it the formation is differ- 

 ent, and this Senecio was not found outside this particular for. 

 mation. Numerous clumps of it were found for some distance 

 along the hillside. This was verified by revisiting the locality 

 on May 25, 1910. 



The Eagle river is a branch of the Grand river, entering it 

 some distance above Glenwood Springs. While I can not speak 

 with any degree of authority in regard to the geological forma- 

 tions, and have no work at hand from which I can quote, the 

 formation below Glenwood Springs, on the north side of the 

 river resembles that about Wolcott. But heie is a long distance, 

 more than a hundred miles, which is unpleasant to traverse, and 

 which I suppose has been only partially looked into by botan- 

 ists. Possibly where the soil is similar to that in which Se?iecw 

 lanatifolius w^s collected, and where the difference in altitude is 

 not too great, it will again be found. 



It may be said too, that this region is noted for its peculiar 

 plants, which are known only from the type locality. Chryso- 

 thamnus leucocladus^ C. laetevirens^ C. fulcratus^ all collected 

 and described by Dr. Greene, are known only from Grand Junc- 

 tion. Oreocarya aperta, O. alata^ O. nana^ and O. crisiata^ all 

 described by Miss Eastwood, are known only from the country 

 about Grand Junction. That peculiar plant, Encelia nutans 

 Eastw., I think is known only from this same locality; and .some 

 other species could be cited. It is not then very peculiar that 

 Senecio lanatifolins has been collected but once, or is known 

 only from the t)'pe locality. 



What can be said of the origin of these jjcculiar plants? 

 .\re they the product of this particular region, and of compara- 

 tively recent date? Why are they of such limited range? Per- 

 haps some one can suggest a solution of tliese questions. 

 New Windsor, ( olorndo. 



