433 
P. ovina James Macoun, Can. Rec. Sci. 
The specimens from which P. diversifolia pinnatisecta were de- 
scribed, viz: Watson’s nos. 331 and 332 of the King Expedition 
illustrate, I think, not less than three different species. In the 
Gray Herbarium, no. 331 is represented as it seems by a typical 
P. Plattensis. This is doubtless the reason why Watson afterwards 
transferred the var. pinnatisecta to that species. No. 332, which 
Watson, in King’s Report, characterizes as an alpine more hairy 
form, is there represented by a specimen of what James Macoun 
describes as P. ovina. This may be regarded as the typical P 
Pinnatisecta, as the other forms of the collection are already named 
In the Columbia Herbarium, no. 331 is represented: by an un- 
usually large form of P. pinnatisecta (P. ovina Macoun) and no. 
332 by a depauperate specimen of P. Brewer expansa Wats. 
The main differences between P. Plattensis and P. pinnatisecta 
are well pointed out by Prof. Nelson, /. c., only that his character- 
izing of P. Plattensis refers rather to the most common, more pros- 
trate form with narrow segments, mentioned above, and that his 
Specimens representing P. prnnatisecta are unusually large, less hairy 
and with longer segments than usual. The typical form is sub- 
Caespitose, seldom over 1 dm. high, with nearly leafless flowering 
Stems, smaller stipules than in P. Plattensis, and a densely hoary 
pubescence, especially when young. It ranges from Colorado and 
Utah to British America, and is astrictly alpine plant. 
POTENTILLA MILLEFOLIA N. sp. 
Low, prostrate or spreading ; stems numerous from the caudex, 
about 1: dm. long, few-leaved, only a little exceeding the basal 
leaves, appressed-strigose, often sparingly so. Lower stipules 
lanceolate and scarious and brown, the upper ovate-lanceolate, 
acute or acuminate, green, often 2-3 cleft. Basal leaves pinnate, of 
Many pairs, sparingly strigose-ciliate, nearly as long as the stems; 
Stem-leaves much reduced. Leaflets divided nearly to the base 
into linear subulate divisions, which therefore look as if verticillate. 
Pedicels slender, 1-2 cm. long, in fruit abruptly reflexed below the 
Strigose-hirsute calyx. Bractlets and sepals lanceolate, acute, the 
former slightly smaller. Corolla 12-18 mm. in diameter. Petals 
obcordate, deeply notched, longer than the sepals. Stamens about 
20. Achene smooth, with a slender filiform nearly terminal style. 
(Plate 277, figs, 1-5.) 
