MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 61 



(Wats.), P. multiseda (Wats.), P. pinnatiseda (Wats.) Aven Nelson, and P. Drummondii 

 Lehm., and also P. rubriamlh Lehm., but I have not seen any authentic specimens 

 of that species. There are three forms that fairly agree with Lehmann's description and 

 figure of P. rubricaulis. One differs from P. diversifolia Lehm. only in being smaller and 

 with leaves slightly whitened beneath. Following Gray and Watson, I took this to be P. 

 rubricaidis Lehm. and made it a variety of the present species. I described it in the Bul- 

 letin of the Torrey Botanical Club, 23: 396, under the name P. disseda rubricaulis. It 

 naay be a hybrid between P. disseda and P. nivea or P. concinna. It has been collected by 

 Hall and Harbour in 1862 and H. Engelmann in 1856, in Colorado and Wyoming respec- 

 tively. I have, however, since that time found specimens of another species, that agree 

 more closely with Lehmann's description and figure, and regard that as the true P. ntbri- 

 caulis Lehm. 



P. disseda varies much in the form of the leaves. In the type of P. diversifolia Lehm. 

 the lower leaves were pinnate with approximate leaflets, but all the leaves are as often 

 perfectly digitate. The leaflets are larger than in the other related species, oblanceolate, 

 and generally seven in number. In the typical form they are generally appressed-hairy. 

 All specimens seen are from the plain and mountain regions of the West, the range ex- 

 tending from Colorado to California, British Columbia and Saskatchewan. 



Potentilla dissecta glaucophylla (Lehm.) Wats. 



Potentilla glaihcophylla Lehm. Del. Sem. Hort. Bot. Hamb. 1836 : 7. 



Lehm. Linnaea, 7 : Litt. 83. 



Potentilla diversifolia glaucoi^hylla Lehm. Rev. Pot. 73. 1856. 



Wats. King's Exp. 5 : 86 ; Walp. Ann. 2 : 483. 



Potentilla disseda glaucophylla Is^ sXs. Proc. Am.. Acad. 8 : 556. 1873. 



Porter & Coulter, Syn. Fl. Col. 37 ; Coulter, Man. Rocky Mts. 85, 1885 ; Macoun, 

 Cat. Can. PI. 517, 1886; Rydb. Bull. Torr. Bot. Club, 23 : 396. 



Leaves nearly glabrous, glaucous-green and always digitate. 



The range is the same as that of the species, but it is much more common within 

 the United States. 



36. Potentilla decurrens (Wats.) Rydb. 



Potentilla disseda var. decurrens Wats. Proc. Am. Acad. 8 : 557. 1873. 



Coulter, Man. Rocky Mts. 85. 1885. 



Potentilla decurrens Rydberg, Bull. Torr. Bot. Club, 23 : 396. 1896. 



