442 ROSACEiE. POTENTILLA. 



Carlton House ! — This species varies considerably. Other varieties are 

 described by Hooker in Bot. mag. fol. 2982, and by Chamisso & Schlech- 

 tendal in Linneea, 2. p. 21. P. macrantha, & uniflora of Ledebour are 

 forms of it. Our specimen of var. /?. from the Arctic Islands (Parry's 2nd 

 voyage) has the very obtuse sepals of P. nana, and indeed wholly resembles 

 that species, except that the petioles are shorter. 



20. P. villosa (Pallas) : densely silky-tomentose ; caudex very large and 

 thick ; stems ascending, several-flowered ; leaves (mostly radical) trifolio- 

 late ; leaflets broadly cuneiform, very silky above, densely toirientose-can- 

 escent beneath, coarsely toothed towards the apex ; stipules ovate, entire ; 

 petals obcordate, nearly twice the length of the ovate calyx-segments.— 

 Pall, in herb. Lamb, ex Pursh, fl. 1. p. 353 ; Lehm. ! Pot. j)- 166, t. 16; 

 Hook. ! Jl. Bor.-Am. 1. p. 194. P. Incida, Willd. ! in Bcrl. mag. 7. p. 

 296. 



Unalaschka, on high mountains, and at Sandwich Sound, Pallas ! N. W. 

 Coast, Menzies! About Behring's Straits, &c. Chamisso! Capt. Beechey ! 

 Sitcha, Bongard ! Dundas Island, &c. Dr. Scouler ! Mount Ranier, Mr. 

 Tolmie! — A striking species. Flowering stems 6-10 inches high, 1-2 leaved. 

 Flowers and leaves rather large. 



21. P. biflora (Lehm.) : stem erect, about 2-flowered, leaves trifoliolate, 

 slightly hairy ; the terminal leaflet 2-parted, the lateral ones deeply 2-parted ; 

 segments linear, entire, ciliate. Lehm. ! conspect. Pot. herb. Willd., Sf Pot. 

 J}. 192, t. 20 ; Richards. a^JjJX. FranM. journ. ed. 2. p. 21 ; Cham. Sf 

 Schlecht. ! in Linncea, 2. jk 24 ,- Hook. ! jl. Bor.-Am. 1 f. 195. 



Barren grounds from lat 64° to the Shores of the Arctic Sea, Richardson! 

 Kotzebue's Sound, Capt. Beechey! Island' of St. Lawrence, Chamisso!— 

 Densely cgespitose. Young leaves rather silky-villous. Petals obcordate, 

 citron-yellow, with an orange-yellow spot on the claw, twice the size of the 

 calyx. Ovaries rugulose. Receptacle densely villous. Richardson. 



22. P. flabcllifolia (Hook. ! mss.) : stem erect, slender, slightly pubes- 

 cent towards the summit, few-flowered ; leaves trifoliolate ; leaflets broadly 

 cuneiform, nearly glabrous, entire towards the base, slightly petiolulate, 

 rounded and deeply toothed or incised at the apex with 7-9 mostly equal 

 spreading teeth ; stipules oval, membranaceous, entire ; pedicels slender ; 

 petals broadly obovate, longer than the ovate acute calyx-segments. 



Summit of Mount Ranier, Oregon, Douglas ! — Root tliick, descending. 

 Flowering stems about 8 inches high, slender, 1-2-leaved, 3-4-flowered. 

 Leaflets scarcely an inch in length, minutely pubescent and ciliate with 

 short appressed hairs, nearly evenly incisely toothed ; the lateral ones mostly 

 dilated and unequal at the base; the terminal decidedly petiolulate. • Calyx 

 and pedicels pubescent : bracteolar segments nearly the length of the true 

 ones, oval or obovate, obtuse. Petals apparently yellow. Ovary glabrous : 

 style filiform. Achenia not seen. 



23. P. brevifolia (Nutt. ! mss.) : minutely glandular- pubescent, dwarf; 

 stems slender, nearly erect, few-flowered ; leaves trifoliolate ; leaflets roundish 

 or slightly cuneiform at the base, 2-3-lobed, crenately toothed, the terminal 

 one distinctly petiolulate ; stipules ovate, mostly entire ; petals obovate, 

 scarcely longer than the ovate-lanceolate calyx-segments ; achenia even. 



"Near the summit of mountains, within the perpetual snow line, near 

 Goodier River of the Oregon. Root dark brown, very long, and thickly 

 clad with stipular vestiges. Whole plant not more than 2-3 inches long, 

 turning blackish in drying. Flowers small, pale yellow. A very distinct 

 species." Nuttall ! — The terminal leaflet is so distinctly petiolulate and 

 often deeply 3-lobed, that the leaf might be said to be pinnate, with the 



