Ponerorchis tetraloba

Ponerorchis tetraloba (synonym "Amitostigma tetralobum") is a species of plant in the family Orchidaceae. It is endemic to China known from only Sichuan and Yunnan. The flowers are pink or pale purple.
Taxonomy.
The species was first described in 1912 by Achille Eugène Finet, as "Peristylus tetralobus". It has been placed in both "Orchis" and "Amitostigma". A molecular phylogenetic study in 2014, in which this species was included as "Amitostigma tetralobum", 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 tetraloba".