Silverweed

Argentina subarctica Rydberg, sp. nov
Basal leaves 7-15 cm. long, ascending ; rachis silky, with appressed or ascending hairs ;
larger leaflets 15-19, dark-green and sparingly silky above, densely white-silky and tomentose beneath, deeply serrate with narrowly lanceolate teeth ; the upper leaflet 1.5-2 cm. lorig; stolons 1-4 dm. long, slender, appressed-silky; peduncles 5-10 cm. long; hypanthium about
5 mm. wide, silky and tomentulose, acute at the base ; bractlets linear-lanceolate, 3-6 mm.
long; sepals ovate, 5-6 mm. long; petals oval or suborbicular, about 8mm. long; achenes
neither grooved nor corky.
Type collected on Yukon River, near Palisades, Alaska, in 1903, Arthur Ho Hick (herb. N. Y. Bot. Gard.) .
Distribution : Alaska and Yukon District ; apparently also in the mountains of Idaho and Montana.

Potentilla subarctica Rydberg, sp. no v
Potentilla pulchella elatior Lange, Comp. Fl. Groenl. 4. 1880. Not P. elatior Willd. 1815.
A low perennial, with thick tap-root and short scaly caudex; stems decumbent at the base, sparingly villous, more or less purple-tinged, 1-3 dm. high ; basal leaves pinnate, with -3-5 leaflets, the terminal one usually decidedly stalked ; stipules scarious, brown ; petioles 3-5 cm. long, more or less densely villous; leaflets obovate, green but appressed-silky above, grayish-tomentose beneath, deeply cleft into oblong or lanceolate, mostly obtuse -divisions ; the terminal leaflets 2-3 cm. long, the lower ones much smaller ; stem-leaves mostly 3-foliolate, the lower petioled, the upper sessile ; stipules foliaceous, lanceolate to elliptic; cyme open; hypanthium villous; bractlets usually elliptic, obtuse, nearly equaling the ovate acute sepals, which are about 5. mm. long; petals yellow, broadly obovate, usually emarginate ; stamens about 20 ; pistils numerous ; styles short and glandular
at the base.
Type locality : Ritenbenk, West Greenland.
Distribution : Greenland and the arctic islands and coast of North America.