Northern Prairie Wildlife Research Center
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.
||Leaf blades palmately lobed.
||Leaf blades sagittate, merely toothed and not lobed.
49. Asteraceae, the Aster Family
13. Petasites Mill. -- Sweet coltsfoot
- 1. Petasites frigidus (L.) Fries
- 2. Petasites sagittatus (Pursh) A.
Return to Family -- Asteraceae - The Aster Family
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