138 I^EAFLETS. 



its segments triangular-lanceolate, very acute, the bracteoles 

 less than half as long, lanceolate : carpels 8 or 10, small, 

 smooth, dull -green. 



Fort Valley, northern Arizona, at 7250 feet altitude, 4 Sept., 

 1909, H. D. Burrall. 



PoTENTiLLA MoGOLLONiCA. Perennial, of the Leucophyllae 

 (Rydb.), but of low stature, thinnish texture, the plant in no 

 part whitened with indument: basal leaves barely 4 inches long 

 inclusive of the short petiole, the leaflets 5 to 7, pinnately 

 arranged and approximate, 1 to 1/^ inches long, oblong or 

 obovate-oblong, coarsely and rather acutely serrate, the upper 

 pair strongly decurrent, lower face hoary with both a thin 

 close tomentum and some long slender appressed hairs, upper 

 face quite green but with scattered long appressed hairs, this 

 kind more conspicuous at the margins of all leaflets : flowering 

 stems slender, ascending, surpassing the foliage by no more 

 than 1 or 2 inches, the flowers few and on slender pedicels : 

 calyx thinly appressed- villous, deeply cleft, the segments 

 ovate-lanceolate, acute but not strongly so, bracteoles lance- 

 oblong, short: petals of twice the length of the calyx, light- 

 yellow, very retuse but scarcely obcordate ; pistils apparently 

 only 5 or 6. 



Mogollon Mountains, New Mexico, 25 Aug., 1903, O. B. 

 Metcalfe, distributed for P, ambigens, under his n. 594 ; but 

 the sheet in U. S. Herb. (n. 495585) shows two specimens of 

 the plant here described, and one of the very different thing, 

 P. propinqua, Rydb. 



P0TENT1L1.A Wardii. Tufted perennial, of the white- 

 leaved group and with white indument: basal leaves many 

 and almost upright, 2 to 4 inches long and the length mainly 

 petiolar, the mostly 7 leaflets crowded upon a rachis of less 

 than V2 inch ; leaflets of firm texture, >^ to 1 inch long, 

 closely and not very deeply subfalcately serrate, lower face 

 white-tomentose without silky hairs except on the midvein, 

 this densely clothed with them, upper face silvery-silky but 





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