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The white marsh marigold (Caltha leptosepala) belongs to Ranunculaceae (the Buttercup family). It is a perennial herb that is native to western North America, from Alaska to New Mexico. This herb grows in open, wet, subalpine and alpine marshes, and it can reach about 30 cm in height. The stems are erect, leafless or with one leaf. The leaves are basal, oblong-ovate to orbiculate-reniform with smooth, wrinkled, or toothed edges. The usually white or sometimes yellow flowers bloom from May to June. Each flower is 1-4 cm wide and lacks petals, having instead petallike sepals with the many long, flat stamens and fewer pistils in the center.
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