Butterweed red stem
Butterweed Missouri Department of Conservation
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Butterweed
Adobe Web Photo Gallery
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Butterweed – A Naturalist's Journey
Senecio hydrophiloides, Sweet Marsh Butterweed
Butterweed Photos for Sale - Fine Art America
Weed of the Month: Cressleaf Groundsel or Butterweed // Integrated Crop and Pest Management News Article // Integrated Pest Management, University of Missouri
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Packera glabella page