Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
13. Petasites Mill. -- Sweet coltsfoot2. Petasites sagittatus (Pursh) A. Gray
Similar to the preceding in habit; flowering stems 3-6 dm tall, thinly white-tomentose, sometimes glandular-puberulent as well. Basal leaf blades sagittate and toothed, 5-20 cm long, 3-30 cm wide, glabrous to thinly tomentose above, densely white-tomentose beneath; cauline leaves averaging longer and narrower than in P. frigidus, the lower ones often with abortive blades; petioles of basal leaves 1-3 dm long. Heads as in the preceding. May--Jun. Fresh wet meadows, boggy and swampy woodlands; uncommon in nc and ne ND, the Black Hills, SD, and se WY; (Labr. to AK, s to MN, SD, CO, ID and WA).
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