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Aquatic and Wetland Vascular Plants of the Northern Great Plains

Petasites Mill. -- Sweet coltsfoot


Rhizomatous perennials; principal leaves basal, long-petioled, the blades sagittate or palmate, white-woolly at least on the lower surface; cauline leaves reduced and bractlike, alternate. Heads radiate or discoid, subdioecious, several to many in a racemiform or corymbiform inflorescence; involucral bracts in a single series, sometimes with a few reduced bracts below, broadly linear, herbaceous with scarious margins; receptacle flat, naked; female heads inconspicuously radiate, the florets all or nearly all pistillate, with a filiform corolla, some with whitish ligules; style shallowly 2-lobed, puberulent; male heads discoid, the florets with style and ovary but not developing achenes, their corollas tubular, 5-lobed. Achenes linear, 5- to 10-ribbed; pappus of numerous white capillary bristles, that of the sterile florets reduced.

Lead Characteristic Go To
1 Leaf blades palmately lobed. P. frigidus
1 Leaf blades sagittate, merely toothed and not lobed. P. sagittatus


49. Asteraceae, the Aster Family
13. Petasites Mill. -- Sweet coltsfoot
1. Petasites frigidus (L.) Fries
2. Petasites sagittatus (Pursh) A. Gray


Return to Family -- Asteraceae - The Aster Family
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