MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 73 



scattered long hairs, pale green. Stipules ovate in outline, 1-1.5 cm. long, generally pecti- 

 nately toothed. Lower leaves digitate, of about 7 leaflets, with petioles about 1 dm. long, 

 sparingly pubescent and hirsute on both sides, pale green, strongly veined, the upper 5- 

 foliolate and short-petioled and the uppermost ternate and sessile ; leaflets narrowly ob- 

 lanceolate, deeply toothed, with triangular acute divergent teeth. Hypanthium hirsute, 

 in fruit 12-15 cm. in diameter; bractlets oblong-lanceolate, about equalling the triangu- 

 lar-lanceolate acute sepals. Corolla about 20 mm. in diameter; petals obovate, deeply 

 emarginate, sulphur yellow, about half exceeding the sepals. 



This sometimes resembles P. NuttaUil in pubescence and general habit, but differs in 

 being paler and in its large pale yellow petals. It is of European origin and occurs spar- 

 ingly from the Eastern States to the District of Columbia and to Ohio. 



The following specimens have been examined : 



New York: W. W. Rowlee, 1892 ; C. S. Sheldon, 1880; Jos Schrenk, 1877 ; Curtice 

 & Kilborne, No. 41, 1879 ; J. H. Wibbe. 



New Jersey : S. W. Knipe. 



District of Columbia: W. H. Seaman, 1875. 



Ohio: Wm. C. Werner, No. 21, 1890. 



Midiigan: W. J. Beal, No. 2055, 1890. 



Vermont: H. E. Sargent. 



Ontario : Macoim, No. 74, 1882. 



53. Potentilla pectinisecta Rydb. 



Potentilla pcdiniseda Rydberg, Bull. Torr. Bot. Club, 24: 7. 1897. 



Illustrations : Plate 21, f. 2-6 ; lower part of stem, /. 2; dissection of flower,/. 3 ; 

 stamen,/. 4; pistil,/ 5 ; fruiting hypanthium and calyx,/ 6. 



Stem slender, 3-4 dm. high, ascending, finely strigose or hirsute. Stipules ovate, 

 often toothed. Leaves slender-petioled, digitate, of 5-8 leaflets, appressed-silky on both 

 sides and sometimes shghtly tomentulose beneath ; leaflets obovate, deeply pectinately 

 divided into oblong or linear segments. Cyme rather dense ; hypanthium appressed- 

 silky; bractlets linear-lanceolate, shorter than the broadly lanceolate sepals. Petals yel- 

 low, obcordate, scarcely exceeding the sepals. 



It has gone under the names of P. gracilis flahelliformis and fastigiatn. It resembles 

 P. fastigiata in general habit and pubescence, but is more slender. The form of the 

 leaflets is most Uke that of P. Blaschkeana and P. Nuttallii, and sometimes that of P. 

 flabelliformis, but the plant is more delicate and the pubescence is silky and rather 

 scant. 



