190 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



fornia and in the mountains to New Mexico and Arizona. It is also a native of Siberia, 

 the mountains of England, France and Spain and the island Oeland in the Baltic 

 Sea. The typical form grovy^s mostly in rich soil along streams. A form with very large 

 flowers, 3 cm. in diameter, is P fruficosa grandiflora Lehmann, Mag. Ges. Nat. Fr. Berlin, 

 7: 284 and Rev. Pot. 16; this has been collected in Colorado by C. F. Baker, in 1896; 

 it does not deserve even varietal rank ; the same may perhaps be said of the following. 



Dasiphora fruticosa tenuifolia (Willd.). 



Potentilla tenuifolia Willd.; Schlecht. Mag. Ges. Naturf. Fr. Berlin, 7: 284. 1813. 



Potentilla floribunda Pursh, Fl. Am. Sept. 355. 1814. 



Poir. Suppl. 4: 540; Eat. Man. Ed. 2, 380; Ed. 3, 408; Bigel. Fl. Bost. Ed. 2, 

 203; PL Bost. 216; Don, Gard. Diet. 2: 561. 



Potentilla Laureironis Tratt. Bos. Mon. 4. 



Potentilla fnUicosa var. tenuifolia Lehm. Monog. 1820. 



Lehm. Rev. Pot. 17; Walp. Ann. 2 : 470. 



Potentilla fruticosa var. tenuiloba Turczon. Bull. Soc. Nat. Moscow, 16: 615. 



Ser. in DC. Prod. 2 : 279. 



Dasyphora floribunda Raf. Aut. Bot. 167. 1838. 



Illustrations : Amman, Ruth. _p/. 18, f. 1. 



Leaflets hnear-oblong, with revolute margins, shrub lower and more hairy. 



This is only the high mountain form of D. fruticosa, especially when growing among 

 exposed rocks. It has the same distribution as the species and is perhaps more common. 

 The extreme is reached by 



Dasiphora fruticosa monticola. 



Potentilla fruticosa var. parvifolia Wats. Proc. Am. Acad. 7: 561. 1873. Not P. 

 parvifolia Fisch. (1831), which is also a Dasiphora. 



Potentilla fruticosa var. alpina Wats. & Rothr. Cat. PL Wheeler Surv. 8 : 1874. Not 

 P. alpina Dalla. 



Rothr. Wheeler's Rep. 4: 114. 



Illustrations : Plate 101, f. 7. 



Leaflets very small, about .5 cm. long, linear; flowers small, about 1 cm. in diameter 

 on comparatively long pedicels. 



^'evada: Watson (King's Exp.), No. 342. 



12. DRYMOCALLIS Fourr. 

 Potentilla L. Sp. Fl. 495. In part. 1753. 

 Argentina Lam. Fl. Frang. 3: 118. In part. 1778. 



