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Caltha palustris
It is a perennial herbaceous plant of the family Ranunculaceae. Height is up to 80 centimetres tall. The leaves are rounded to kidney-shaped, 3–20 centimetres across, with a bluntly serrated margin and a thick, waxy texture. Stems are hollow. The flowers are yellow, 2–5 cm diameter, with 4-9 (mostly 5) petal-like sepals and many yellow stamens; they appear in early spring to late summer. The flowers are visited by a great variety of insects for pollen and for the nectar secreted from small depressions, one on each side of each carpel.
Native to marshes, fens, ditches and wet woodland in temperate regions of the Northern Hemisphere.
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