100 MEMOIRS FROM THE DEPAliTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Potentilla bipinnatifida platyloba. 



Potcutilla indchcrrhna Rydb. Fl. Neb. 21 : 16. 1895. Not Lehm. 



Illustratioxs : Plate .J9, f. 6-7 



Stouter; leaves pinnate with generally but two pairs of obovate leaflets with short 

 broadly lanceolate or oblong loli.es. Stipules ver}- large and broad. Bractlets broadly 

 oblong. Sei.als ovate. Hypanthium nearly e}'lindric, in fruit equalhng the sepals. 

 Cyme with erect branches in fruit. 



A rare form and perhaps specifically distinct, but the flowers (although somewhat 

 larger) and the pubescence are exactly the same as in P bipinnatifich- It needs to be 

 studied in the field. The following specimens illustrate this variety : 



Nebraska : Smith & Pound, No. 85, 1892 ; Williamson. 



Hudson Bay: Bell, No. U42, in part, 1880 (York Factory). 



Alberfu: J. Macoun, No. 1, 1897. 



Avti'tnibow : John Macoun, No. 10457, 1895. 



§ i6. RUBRICAULES. 



8i. Potentilla filicaulis (Nutt.) Rydb. 



Potcutilla cfasa fill caul Is ^utt; Torr. ct Gray, Fl. N. A. 1 : 437. 1840. 



Lehm. Rev. Pot. G4 ; Walp. Rc-p. 2 : .32 ; Ann. 2 : 480. 



PotentiUa filkaidls Rydb. Bull. Torr. But. Club, 24: 2. 1897. 



Illxtstratioxs : Plate 40, f. .J,- dissection of flower,/. G; pistil,/. 7; stamens,/ 5; 

 fruiting hypanthium and calyx,/. !i. 



Cespitose, stems several from the caudex, erect or ascending, 1 dm. high or less, 

 silky-strigose, few-leaved. Stipules o\'ate-lance(jlate, acute, 5-10 mm. long. Basal leaves 

 many, pinnate with2-o pairs of approximate leaflets or subdigitately 5-7-foliolate, densely 

 silky on both sides and slightly tomentose l^eneath ; leaflets cuneate, 1-2 cm. long, 

 coarsely toothed with ovate teeth. Stem leaves small. C}-me few-flowered. Hypan- 

 thium white-silky, in fruit 4-5 lum. in diameter ; bractlets oblong, much shorter than 

 the ovate or ovate-lanceolate acute sepals. Petals obcordate, much longer than the sepals. 



This species was first pubhshed as a variety of P. rfam, but it is more closely related to 

 P Plipplana, having the same pubescence and tJie same form of bractlets and sepals. It 

 may be a depauperate state of that si)ecies, but no truly intermediate forms have been seen. 



The following specimens belong here : 



Rochj ^loantainx . Nuttall. 



Colo n I do : Pammel, 1806. 



Idaho: J. M. Coulter, ls72. 



