MEMOIRS FROM THE DEPARTMENT OF BOTANY OP COLUMBIA UNIVERSITY 101 



82. Potentilla Macounii. 



Illustration : Plate 4.I, f. 1. 



Cespitose ; stems generally more than one from the caudex, ascending, silky- villous, 

 less than 1 dm. high, 1-2-leaved. Stipules ovate, 5-10 mm. long. Basal leaves many, 

 pinnate with 3-5 pairs of rather approximate leaflets, silky on both sides and somewhat 

 tomentose beneath ; leaflets cuneate, about 1 cm. long, deeply cleft into oblong segments ; 

 stem leaves much reduced. Cyme few-flowered. Hypanthium silky-villous, in fruit 7-8 

 mm. in diameter ; bractlets lanceolate, often nearly as long as the ovate sepals. Sta- 

 mens about 20. Style filiform. 



It much resembles the preceding species in habit, but differs in the larger bractlets, 

 the longer and looser hairiness and the more numerous and deeply dissected leaflets. It 

 is apparently nearly related to P. pinnatisecta, from which it differs mostly in the hairi- 

 ness, the tomentum and the broader segments of the leaves. 



Alberta: John Macoun, No. 16709, 1897 (Crow's nest Pass). 



Montana : Flodman, No. 556, 1896 (Little Belt IMountains). 



83. Potentilla luteosericea. 



Perennial by a thick deep root and a short erect caudex. Stems several, decumbent or ascend- 

 ing, .5-2 dm. long, few-leaved, yellowish-silky. Basal leaves pinnate, with 1 or 2 approximate pairs of 

 leaflets, densely yellowish-silky canescent on both sides ; leaflets cuneate or obovate, entire at the 

 base, 3-7 -toothed toward the apex. Hypanthium yellowish-silky, about 5 mm. in diameter ; bractlets 

 ovate, obtuse, a little shorter than the ovate-lanceolate acutish sepals. Petals obcordate, light yel- 

 low, exceeding the sepals by about a third. 



This resembles somewhat the figure of P. Domheyi in Nestler's Monograph, but that plant, ac- 

 cording to ISTestler and Lehmann, is only sparingly pilose. 



Lower California: T. S. Brandegee, 1893 (San Pedro Martin ; type in Herb. Calif. Acad. Sci.). 



84. Potentilla rubricaulis Lehm. 



Potentilla rubricaulis Lehm. Stirp. Pug. 2: 11. 1830. 



Hook. Fl. Bor. Am. 1 : 191 ; Eat. Man. Ed. 7 : 459 ; Torr. & Gray, Fl. N. A. 1 : 

 438; Rev. Pot. 68 ; Eat. & Wr. N. Am. Bot. 374 ; Don, Card. Diet. 2 : 556; Dietr. Syn. 

 PL 3: 185; Walp. Rep. 2 : 32; Ann. 2 : 482. 



Illustrations: Lehm. Rev. Pot. pZ. 30. Plate ^0,/. 1; pistil,/. 2; stamen,/. 3; 

 fruiting hypanthium and calyx, /. 4- 



More or less cespitose ; stems ascending or prostrate, generally not much over 1 dm. 

 long, appressed silky-strigose, more or less leafy and branched. Stipules ovate, acute. 

 Leaves pinnate of 2-3 approximate pairs and a sessile terminal leaflet, silky above, more 

 or less white-tomentulose beneath ; leaflets 5-10 mm. long, obovate or oblong in out- 



