Sitf confirms this plant as Maxillaria purpureolabia (Nov 2024). This plant is an excellent match to the photos and illustrations in Christenson's Maxillaria Monograph Vol. 2, including a distinctive, obscurely 3-lobed lip. The same drawing can be found in Icones Orchidacearum Peruviarum, Plate 702 and in the IOSPE. The size of flower is a little small, but the flower form, color, and plant habit match M. purpureolabia.