Lai Chau Prov., Sin Ho Distr., De Phin comm., around point 22°19’05.9N 103°13’53.8E. Degraded primary and secondary evergreen broad-leaved forest on steep mountain slopes composed with shaly limestone at elevation about 1600 m a.s.l. Terrestrial and lithophytic herb in open wet places along stream. Flowers purple. Locally very common. 05 October 2016 CPC 8248