Silverweed Cinquefoil

Argentina anserina (L.) Rydb. Mem. Dep. Bot. Columbia
Univ. 2 : 159. 1898.
Poteniilla Anserina L,. Sp. PI. 495. 1753. Poteniilla Argentina Huds. Fl. Angl. 195. 1762. Argentina vulgaris L,am. Fl. Fr. 3 : 119. 1778. Uactylophyllum Anserina Spenn. Fl. Frib. 1084. 1829. Fragaria Anserina Crantz, Stirp. Austr. 2 : 9. 1763.
Main stem almost none, from a cluster of fascicled roots and producing numerous runners
3-6 dm. long ; leaves 1-2 dm. long, interruptedly pinnate, with 9-31 larger leaflets and smaller
interposed, in the typical form spreading or flat on the ground, slightly silky and green
above, white-silky and tomentose beneath ; larger leaflets 1^4 cm. long, oblong or oblanceo-
late, usually acute, deeply and sharply serrate with linear-lanceolate teeth in the Buropean
and eastern American form, more obovate, rounded at the apex and with broader ovate
•or triangular teeth in the Rocky Mountain form ; flowers 1-2 cm. in diameter, on pedicels
3-10 cm. long ; bractlets simple and lanceolate, or often broader, ovate-lanceolate, toothed
or divided, generally a little longer than the broadly ovate sepals ; petals oval, 7-10 mm.
long ; achenes numerous, corky, very thick, grooved at the upper end.
Type locality : Europe.
Distribution: Native of Europe and Asia; probably only naturalized in eastern America, from Canada to Wisconsin, Iowa, and New York, but native from Manitoba to New Mexico,
southern California, and Alaska.