Flora of Scotts Creek Watershed
Petasites frigidus var. palmatus - Western Coltsfoot
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Family Name: Asteraceae
Common Names: Western Coltsfoot, Arctic Sweet Coltsfoot
Origin: Native to California
Habitat: Moist areas in forests, roadside ditches, below 400 m.
Life Form and Duration: Perennial Herb, 10-60 cm
Comments on overall growth: Flowering stems appear before leaves. Has stout rhizome.
Foliage Description: Leaves develop after appearance of flowering stem. Leaves are basal, large 10-40 cm broad, round to reniform (kidney shaped), palmately lobed, coarsely toothed, upper surface green, lower surface white wooly, on long hollow leaf stalks 10-40 cm long.
Flower Description: Flowering stems appear in early spring. Heads disciform, 10-20 in dense raceme-like clusters at the top of the flowering stem. Stem with linear bracts, 2-6 cm long, entire to serrate, parallel-veined, whitish-green. Plants dioecious, male and female flowers on separate plants. Pistillate ray flowers, white to pale pink, ray 2-7 mm. Staminate disk flowers, white to pale pink.
Flowering Season: March-July
Fruit Type: Achene
Fruit Description: 3-4.5 mm, light brown, with many pappus bristles 6-13 mm, hanging from blackish receptacle.