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We examined the floral development of Dichocarpum fargesii, Thalictrum fargesii, Thalictrum przewalskii, and Aquilegia yabeana in Thalictroideae, Ranunculaceae, by scanning electron microscope. The sepals are initiated spirally in D. fargesii and A. yabeana, and in two pairs (with four sepals) or spirally (with five sepals) in T. fargesii and T. przewalskii. The petals in D.fargesii and A.yabeana...
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