Ponerorchis bifoliata

Ponerorchis bifoliatum (synonym "Amitostigma bifoliatum") is a species of plant in the family Orchidaceae. It is endemic to China, known only from Gansu and Sichuan. It produces pale purple flowers.
Taxonomy.
The species was first described in 1936 by Tsin Tang and Fa Tsuan Wang, as "Amitostigma bifoliatum". A molecular phylogenetic study in 2014 found that species of "Amitostigma", "Neottianthe" and "Ponerorchis" were mixed together in a single clade, making none of the three genera monophyletic as then circumscribed. "Amitostigma" and "Neottianthe" were subsumed into "Ponerorchis", with this species becoming "Ponerorchis bifoliata".