Arctic Sweet Coltsfoot

Petasites vitifolius Greene, Leaflets 1: 180. 1906
Pctositcs Irigonophyllus Greene, Leaflets 1: 180. 1906.
A perennial herb, with horizontal rootstock; scape 2-5 dm. high, slightly floccose when young; scales lanceolate, 2-5 cm. long; petioles of the basal leaves 1-3 dm. long; blades triangular to deltoid-cordate in outline, 5-25 cm. wide, 5-15 cm. long from the open basal sinus to the tip, 3-9-Iobed halfway to the base or less, thin, in age glabrate above, white-tomentose beneath, the lobes sinuately toothed; inflorescence corymbose; involucre of the hermaphrodite plant 10-12 mm. high and broad; bracts about 15, linear-lanceolate; ray -flowers 15-20; tube of the corolla about 6 mm. long; ligules oblong-spatulate, 5 mm. long, 2 mm. wide; diskflowers numerous; corolla-tube 4 mm. long; throat about 3 mm. long; lobes lance-ovate; pappus-bristles few, 6 mm. long; involucre of the pistillate plant smaller, turbinate, 8 mm. long and broad ; bracts narrow ; ligules erect, linear, those of the marginal flowers about 2 mm. long, those of the inner smaller or rudimentary; pappus in anthesis 4-5 mm. long, in fruit 12-15 mm. long.
Type LOCALITY: Emerson, Manitoba.
Distribution: Gaspe Peninsula, Quebec, to Minnesota and Alberta.