MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 57 



P. ramulosa resembles P. subvi.^com, but is a much larger plant. The leaves, by then- 

 size, pubescence and form, remind one somewhat of P. NuttaUii and P. Blaschkeana. The 

 leaflets reach a length of even 7 cm. The general habit, form of calyx and corolla, etc.; 

 are those of P. subviscosa, but the achenes are striate. The following specimens have 

 been examined : 



Arizona : J. G. Lemmon, No. 399, 1881 ; H. H. Rusby, 1883 ; G. C. Nealley, No. 

 110, 1891. 



§ 8. AUREAE. 



32. Potentilla Sierrae-Blancae Wooton & Rydberg. 



Illustrations: Plate 18, f. 3; pistil, /. 4.; fruiting hypanthium and calyx,/. 5. 



Perennial, mth a branched caudex covered with the brown remains of stipules and 

 leaf-stalks. Basal leaves numerous, with slender petioles 3-5 cm. long, digitately 5-folio- 

 late, almost perfectly glabrous and dark green ; leaflets 1-2 cm. long, almost oblong-linear, 

 slightly tapering downward, entire except the 3-toothed apex. Stipules lanceolate, cili- 

 ate. Flowering stems very slender, almost leafless and generally 1-flowered, 4-6 cm. 

 long, scarcely exceeding the leaves, finely and " sparingly villous. Hj^panthium slightly 

 villous, in fruit about 5 mm. in diameter ; bractlets linear-oblong, obtuse, about a third 

 shorter than the ovate-lanceolate sepals. Petals unknown. 



In the habit and form of the leaves this most resembles P. hicrenata, but is more 

 tufted and almost glabrous. It has been collected only in fruit. 



New Mexico: E. O. Wooton, No. 469 (type), collected in the White Mountains, Aug. 

 16, 1897. 



33. Potentilla ranunculoides Hiimb. & Bonpl. 



Potentilla ranunculoides Humb. & Bonpl ; Nestler, Mon. Pot. 26 and 56. 1816. 



Lehm. Mon. 25 and 114 ; Poir. Suppl. 4 : 542 ; DC. Prod. 2 : 576 ; Sprengel, Syst. Veg. 2 : 537 ; 

 H.B.K. ]Srov. Gen. et Sp. 4: 216; Hemsley, Biol. Cent. Am. 1: 376; Don, Gard. Diet. 2: 553; 

 Dietr. Syn. PI. 3 : 181 ; Walp. Ann. 2 : 498 ; Rydb. Bull. Torr. Bot. Club, 23 : 397. 



Potentilla TnaerorhizaWilld.; Schlecht. Mag. Ges< Naturf. Fr. Berlin, 7: 292.* 



Illustrations : N"estler, Mon. Pot. pi. S, /. 1. 



Stem short, erect, few-leaved and few-flowered, slightly silky-strigose. Basal leaves digitately 5-7- 

 foliolate ; stem leaves small, ternate, all glabrous except on the veins and the margins ; leaflets rounded- 

 obovate, thick, strongly veined, crenate above the middle ; bractlets oblong, obtuse, about half as 

 long as the lanceolate acuminate sepals. Petals obcordate, one-half longer than the sepals. 



Near the base of the mountains of Central Mexico. 



