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UMass Extension Weed Herbarium
 

Common Name: butterbur, butterbur-dock
Scientific Name: Petasites hybridus (L.) Gaertn., Mey. & Scherb.
Family Name: Asteraceae (Compositae) - Aster or Sunflower Family

Identification Notes:

life cycle - introduced perennial, reproducing by seed, tuberous base and fleshy creeping roots

stems – reproductive stems, upright, leaf scales growth habit 2, growth habit 2

leaves – arising from swollen base, roundish and somewhat heart-shaped or kidney-shaped, very large, petioles long and hollow with ridges, margins irregularly toothed, smooth above, wooly below leaves 1, leaves 2

flowers – heads of pink-purple disk (tabulate) florets arranged in dense spike on thick stalk, dioecious with male and female on separate plants, appear before foliage emergences

Images:

Petasites hybridus thumbnail 1 Petasites hybridus thumbnail 2 Petasites hybridus thumbnail 3 Petasites hybridus thumbnail 4
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eturn to weed index sorted by: Common Name | Scientific Name | Family Name

 

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