100 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
Potentilla bipinnatifida platyloba. 
Potentilla pulcherrima Rydb. Fl. Neb. 21: 16. 1895. Not Lehm. 
ILLUSTRATIONS: PLATE 39, iP 6-7. 
Stouter; leaves pinnate with generally but two pairs of obovate leaflets with short 
broadly lanceolate or oblong lobes. Stipules very large and broad. Bractlets broadly 
oblong. Sepals ovate. Hypanthium nearly cylindric, in fruit equalling 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 asin P. bipinnatifida. 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. 1442, in part, 1880 (York Factory). 
Alberta: J. Macoun, No. 1, 1897. 
Assiniboia: John Macoun, No. 10457, 1895. 
$16. RUBRICAULES. 
81. Potentilla filicaulis ( Nutt.) Rydb. 
Potentilla effusa filicaulis Nutt.; Torr. & Gray, Fl. N. A. 1: 487. 1840. 
Lehm. Rev. Pot. 64; Walp. Rep. 2: 32; Ann. 2: 480. 
Potentilla filicauis Rydb. Bull. Torr. Bot. Club, 24: 2. 1897. 
Intustrations: PLare 40, f. 5; dissection of flower, f. 6; pistil, f. 7; stamens, f. 8; 
fruiting hypanthium and calyx, f. 9. 
Cespitose, stems several from the caudex, erect or ascending, 1 dm. high or less, 
silky-strigose, few-leaved. Stipules ovate-lanceolate, acute, 5-10 mm. long. Basal leaves 
many, pinnate with 2-3 pairs of approximate leaflets or subdigitately 5-7-foliolate, densely 
silky on both sides aad slightly tomentose beneath ; leaflets cuneate, 1-2 cm. long, 
coarsely toothed with ovate teeth. Stem leaves small. Cyme few-flowered. Hypan- 
thium white-silky, in fruit 4-5 mm. 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 published asa variety of P. effusa, but it is more closely related to 
P. Hippiana, haying the same pubescence and the same form of bractlets and sepals. It 
may be a depauperate state of that species, but no truly intermediate forms have been seen. 
The following specimens belong here : 
Rocky Mountains: Nuttall. 
Colorado: Pammel, 1896. 
Idaho: J. M. Coulter, 1872. 
