The scientific name would be Pouteria campechiana.
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Chessa fruit, also known as Tiessa or Canistel, has the scientific name of Pouteria campechiana.
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The tree (Pouteria campechiana) is native to Mexico, Central America, and the Caribbean. Normally the fruit is eaten, but there are some initial reports of an unique lectin with anti-fungal activity that can be extracted from the seeds. == ==