The micrantha is a wild citrus from the papeda group, native to southern Philippines, particularly islands of Cebu and Bohol. Two varieties are recognized: small-flowered papeda (C. hystrix var. micrantha), locally known as biasong, and small-fruited papeda (C. hystrix var. microcarpa) or samuyao.[3][4]
Although long viewed as a separate species, C. micrantha, it is now generally viewed to fall within Citrus hystrix, but genomic data on the latter is insufficient for a definitive conclusion.[5] A micrantha was one of the progenitor species of some varieties of lime.[6]
^Khan, Iqrar A.; Grosser, Jude W. (2004-05-01). "Regeneration and characterization of somatic hybrid plants of Citrus sinensis (sweet orange) and Citrus micrantha, a progenitor species of lime". Euphytica. 137 (2). Kluwer Academic Publishers: 271–278. doi:10.1023/B:EUPH.0000041591.65333.3c. ISSN1573-5060. S2CID12880471.