149 



the Douglas Spruce, which covered the whole mountain side so 

 thickly as to permit only occasional glimpses of the surrounding 

 country; the few plants which flourished among the trees were 

 chiefly Ericaceous, and there was created a general impression of 

 having been suddenly transported through several degrees of 

 latitude. It was here that we found the excellent new Lupine, 

 described farther on under the name of L. sylvestris. 



At the foot of the mountain lies Hy-Am-Pum Valley, a 

 pleasant litde spot, through which flows the South Fork of Trinity 

 River. We explored the river banks and adjoining slopes for 

 some twelve miles, to the mouth of Grouse Creek, and found the 



r 



extensive and interesting flora to be practically distinct from any- 

 thing west of the mountain, so that the summit of South Fork 

 would seem to be a dividing line of some importance. In re- 

 turning, we followed up Grouse Creek, around the northern end 

 of the mountain, and crossed Redwood Creek near its source. 

 Here the line of division is much less clearly defined, but seems 

 to pass along the eastern ridge above the valley of Redwood 

 Creek. From this point to the coast no new features of impor- 

 tance were noticed. 



As a complete list of our collection would occupy too much 

 space, only a few of the more important finds will be given, to- 

 gether with the descriptions of new species. I must here make 

 acknowledgment of the kindness of Prof. E. L. Greene, without 

 whose invaluable assistance many of the species could not have 

 been satisfactorily determined. 



Thlaspl Califonikum, Watson. In fruit, Kneeland Trairie. 



Viola Ilallii, Gray. Same station, in very dry ground. 



Arcnaria macrophylla. Hook. Near the head of Redwood 

 Creek, apparently rare. 



Trifolinm pluviosum, Dougl. Banks of the South Fork of 

 Trinity River, near Grouse Creek. 



T. Howelin, Watson. Pilot Creek, west of South Fork 

 Mountain. Discovered by Mr. Howell in southern Oregon dur- 

 'ng the previous year. 



Hosackia dccianbcns, Hook, and Arn. Abundant on the 



eastern slope of Pilot Ridge. 



Potentilla data, Greene. The species was described from a 



