P. Hemiepiphytica Zamudio & Rzedowski (yes they capitalized the specific
epithet on the label)
This plant is from Oaxaca, 2200 m. Looks rather like P. caudata.
See Acta Botanica Mexicana (1991) 14:23-32
Pinguicula immaculata Zamudio y Lux
>From Nuevo Leon, 1300 m. Very tiny plants no larger than 1.5 cm diameter
with purplish flowers (dry) which remind me of Utricularia. White residue
around the roots is suggestive of the substrate in which it grew.
Michael Chamberland