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Epipactis palustris. a Plant with a loose raceme. b The outer whorl consisted of dorsal sepal and two lateral sepals, and the inner whorl consisted of two petals and lip. c The abaxial side of dorsal sepal, whole surface covered by three- or four-cellular trichomes, numerous stomata present (SEM). d Anomocytic stomata on the top of abaxial ridge on the abaxial side of dorsal sepal (SEM)
