104 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



what like those of P. pinncdi^ccta (Wats.) Aven Nelson (P. ovina Macoun), but are 

 slightly tomentose. The flowers are much larger and the sepals much broader than in 

 that species. It also resembles somewhat P. SommerfeUii, but has much more dissected 

 leaves, and the style is different. The following specimens have been examined : 



Colorado: John Wolf, No. 366, 1873 (Wheeler's expedition, type); Hooker & Gray, 

 177 (Torrey's Peak); Knowdton, No. 19, 1896 (Pike's Peak). 



§ 17. BREVIFOLIAE. 



88. Potentilla brevifolia Nutt. 



PotentiUa brevifolia Nutt.; Torr. & Gray, Fl. N. Am. 1 : 442. 1840. 



Dietr. Syn. PL 3: 183; Walp. Rep. 2 : 34 ; Ann. 2: 482; Lehm. Stirp. Pug. 9: 

 43 ; Rev. Pot. 46. 



Wats. Proc. Am. Acad. 8 : 560 ; Rydberg, Bull. Torr. Bot. Club. 23 : 306. 



Illusteatioxs : Plate 44; f. 1; dissection of flower, /. 2; pistil, /. 3; stamen, 

 /. 4; fruiting hypanthium and calyx, /. .5. 



Plant very low, subcespitose. Stems less than 1 cm. high, slender, 1-2-leaved, ter- 

 ete, glandular-puberulent. Stipules about .5 cm. long, broadly ovate, entire; the lower 

 scarious. Basal leaves many, small, pinnate with 1-2 pairs of leaflets, puberulent. Leaf- 

 lets suborbicular with cuneate base, 2-3-cleft and crenate, .5-1 cm. long. Stem leaves 

 1 or 2, much reduced and subsessile. Hypanthium glandular-puberulent, sometimes 

 with a few long hairs, in fruit less than .5 cm. Flowers about 8 mm. in diameter. 

 Bractlets oblong, obtuse or acutish, a little shorter than the sepals, which are broadly 

 ovate and acute or slightly mucronate. Petals a little longer than the sepals, yellow, 

 obovate and often a little notched. 



This species has leaves with about two pairs of rounded 2-3-cleft and crenate leaf- 

 lets, which are rather small, only .5-1 cm. long. Lehmann included it in the Glandu- 

 losac on account of the habit, which a little resembles that of the group mentioned, and 

 the fact that the plant is somewhat glandular-puberulent. The style is very slender, 

 fihform, not basal, but attached near the apex of the achene ; the anthers are not flat, 

 and are plainly divided into two lobes, and the petals are emarginate. It is confined, as 

 far as known, to the alpine peaks of Oregon and Wyoming. 



Ore<jon: Nuttall ; Wm. C. Cusick, No. 1378, 1886. 



Wyoming: F. Tweedy, No. 204, 1897. (Head of Buffalo Fork.) 



