Kalpi grows in Luzon and Mindanao.
The handsome tree is medium-sized, 5 to 10 meters tall. The acidic fruit is very juicy; they are used like lemons. Size is variable, depressed and globose, with 9 to 11 segments and very thin skin, yellowish when ripe.
- http://www.biodiversitylibrary.org/bibliography/32659#/summary Citrus fruits in the Philippines (book).]
- Carl W. Campbell
- Plant Resistance Genes
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