Thalictrum pubescens (Thalictrum polygamum)
Thalictrum is a genus of 120-200 species of herbaceous perennial flowering plants in the Ranunculaceae (buttercup) family native mostly to temperate regions.
Tall meadow rue flowers don't have any petals; the white starbursts are made up of stamens. In close-up, it becomes apparent that meadow rue flowers have no petals; the conspicuous part of the flower is the white filaments of the stamens. The plant has delicate, finely divided leaves.
• Family: Buttercup (Ranunculaceae)
• Habitat: swamps, streamsides
• Height: 3-8 feet
• Flower size: 1/3 inch across
• Flower color: white
• Flowering time: July to September
• Origin: native
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Photographs (c) Michael R. Martin cedaredenphoto.com
Text sources: Connecticut Botanical Society - http://www.ct-botanical-society.org/galleries/thalictrumpube.html (June 25, 2012)