MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 111 



Illustrations; Lehm. Rev. Pot. pi. 7. Plate 48, f. 1-:J; dissection of flower,/. 3; 

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



Stem erect, 3-7 dm. high, slightly silky-strigose, more or less leafy. Stipules large, 

 1-2 cm. long, ovate, entire. Basal leaves numerous, often 2-3 dm. long, shghtly hairy 

 or glabrate, pinnate with 6-13 pairs of obovate cuneate leaflets 1-4 cm. long, which are 

 coarsely toothed above the middle. Stem leaves smaller and with fewer leaflets. Cyme 

 narrow with rather slender pedicels. Flowers about 15 mm. in diameter. Hypanthium 

 slightly silky, in fruit about 1 cm. in diameter; bractlets oblong, about one-third 

 shorter than the ovate sepals. Petals broadly obcordate, about one-third longer than 

 the sepals. Stamens about 20. Pistils about 30 ; style nearly terminal, filiform, about 

 twice as long as the achene. 



This species has been lost for about 40 years. As in the collections of this country 

 there were no specimens of a Potentilla whose leaves resembled those of Lehmann's plate, 

 and as those of the latter resembled the leaves of Horkelia cmicata, most botanists have 

 cited P. multijuga as a synonym of that • species, and Professor Greene, in Flora Fran- 

 ciscana, has even adopted the name. It is not very likely that such an acute observer 

 and eminent botanist as Dr. Lehmann would have figured a Horkelia with true Potentilla 

 flowers. In two collections, viz., those of the National Herbarium and the herbarium of 

 Harvard University, I have found a Potentilla that answers Lehmann's description and 

 plate, except that the plant is more robust and the leaflets are larger, and more irregu- 

 lar in form and position. 



California: Dr. H. E. Hasse, 1890 (Los Angeles). 



P. multijuga much resembles P. Plattensis, but the leaflets are more numerous, 6-13 

 pairs, obovate-cuneate and toothed only toward the apex, and the sepals broader, ovate 

 and abruptly contracted at the apex. The leaflets in Lehmann's flgure are about 2 cm. 

 long; some in Dr. Hasse's specimens are nearly 5 cm. Lehmann's figure illustrates an 

 undeveloped specimen about 2.5 dm. high. Some of the better developed specimens are 

 7.5 dm. high, w^ith leaves 3 dm. long. 



§19. ARENICOLAE. 

 98. Potentilla Newberryi Gray. 

 Ivesia gracilis Torr. & Gray in Newberry, Pac. R. R. Rep. 6 : part 3, 72. 1857. 

 Brewer & Wats. Bot. Cal. 1 : 184. 



Potentilla Newberryi Gray, Proc. Am. Acad. 6: 532. 1865. 

 Greene, Pittonia, 1 : 105. 



Illustrations: Pac. R. R. Rep. 6: j:i/. 11. Plate 49, f. 1-2; dissection of flower,/ 

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



