MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 67 



44. Potentilla staminea. 



Stem stout, 4-6 dm. high, leafy, more or less villous-tomentose. Basal leaves with densely 

 woolly petioles about 1 dm. long, digitate with 7 leaflets, hairy but green above, densely white-tomen- 

 tose and silky beneath ; leaflets obovate, 4-10 cm. long, coarsely crenate-serrate. Stem-leaves 3-5-folio- 

 late, short-petioled or sessile. Cyme open with long pedicels. Hypanthium villous ; bractlets oblong 

 or lanceolate, about half as long as the ovate-acuminate sepals. Corolla 2.5-3 cm. in diameter ; petals 

 yellow, broadly obcordate, nearly twice as long as the sepals. Stamens about 40 ; styles filiform. 



This resembles most P. leptopetala, differing, however, in the greater size of the plant as well as 

 of the flower, in the greater number of stamens and in the 7-foliolate basal leaves. 



Southern Mexico: Dr. Ghiesbrecht, ISTos. 131 and 681, 1864-70. 



45. Potentilla leptopetala Lehm. 



Potentilla leptopetala Lehm. Ind. Sem. Hort. Bot. Hamb. 1830 : 8. 1830. 



Lehm. Stirp. Pug. 3 : 32 ; Linnaea, 13 : 264 ; Eegensb. Bot. Zeitg. 1 : 133, 1831* ; Eev. Pot. 113 ; 

 Don, Gard. Diet. 2 : 554 ; Dietr. Syn. PL 3 : 183 : Walp. Eep. 2 : 28 : Ann. 2 : 498 ; Hemsley, Biol. 

 Cent. Am. 1 : 376. 



Potentilla hiemalis Schlecht. Linnaea, 5 : 572, 1830 ; Don, Gard. Diet. 2 : 553. 



Potentilla frigida Bchiede & DepY). ; Lehm. Rev. Pot. 113. 1856. 



Illustrations : Lehm. Rev. Pot. pi. US. 



Stem ascending, 1-2-leaA'ed, covered with long grayish reflexed hairs ; basal leaves digitately 5- 

 foliolate, pilose or glabrate and green above, white-tomentose and long silky beneath ; leaflets ovate, 

 strongly nerved, serrate ; bractlets lanceolate, much shorter than the ovate sepals. Petals obcordate, 

 scarcely equalling the sepals. 



In high altitudes of Central Mexico : Crus Blanca and San Salvador,* Schiede ; Mineral del 

 Monte,* C. Ehrenberg. 



46. Potentilla Candida Eydberg. 



Potentilla gracilis var. Wats. King. Exp. 5 : 88. 1872. 



Potentilla Candida Rydberg, Bull. Torr. Bot. Club, 24 : 6. 1897. 



Illustrations: Bull. Torr. Bot. Club, 24: pi. 287. Plate :?5, /. 1; dissection of 

 flower,/. 2; stamen,/. S; pistil,/ 4-; fruiting hypanthium and calyx,/ 5. 



Stem low, 1-2 dm. high, densely white silky-strigose ; stipules ovate, entire, nearly 

 1 cm. long ; leaves on rather short petioles, densely silvery-silky on both sides, digitate ; 

 leaflets 7-9, obovate in outline, 2-4 cm. long, rather thick, deeply incised or cleft into 

 large oblong teeth ; cyme rather dense; flowers about 1 cm. in diameter; hypanthium 

 white-silky; bractlets lanceolate, much shorter than the ovate sepals; petals yellow, ob- 

 cordate, a little exceeding the sepals. 



It most resembles a depauperate P. Blaschkeana, and differs mainly in the pubescence 

 which is very dense on both sides of the leaves and silky ; tomentum none. 



