Adonis amurensis var. pilosissima var. nov., a new variety of Adonis amurensis (Ranunculaceae) from East Asia

A new variety of Adonis amurensis from East Asia, A. amurensis var. pilosissima, is described and illustrated. The new variety is morphologically related to A. amurensis var. amurensis and Adonis pseudoamurensis, but differs from the former by its densely pilose stem and leaves with abundant short hairs not becoming glabrate in fruiting season, and from the latter by its unbranched stem, precocious leaves, and sepals longer than petals. The conservation status of A. amurensis var. pilosissima was assessed according to the IUCN Red List criteria. A distribution map for the species and identification key for all 14 Adonis taxa from East Asia are also provided.