Cruz-Zamora Y., Cruz-García F., Orozco-Arroyo G., Reyes-Santiago J., Martínez-Castilla L. P., Wegier A., Vázquez-Santana S., ×Polascontria (Cactaceae), a nothogenus that represents the gene flow between Escontria and Polaskia, Phytotaxa, 2017, 295(2):141-158, doi: 10.11646/phytotaxa.295.2.3
Morphological evidence, AFLP markers and controlled crosses support a hybrid origin for plants from Mixteca Baja in Oaxaca. The authors describe ×Polascontria huajuapensis as a hybrid between Escontria chiotilla and Polaskia chichipe. Crosses and backcrosses produced viable seeds, while some hybrid fruits and seeds showed developmental abnormalities.