ISLAS-HERNÁNDEZ, C. S., GARCÍA, R. B., & ALVARADO-CÁRDENAS, L. O. (2017). New additions of <em>Spigelia </em>(Loganiaceae) in Mexico. Phytotaxa, 331(2), 243–252. https://doi.org/10.11646/phytotaxa.331.2.8