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Psidium friedrichsthalianum , Photo: Michael Lahanas

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids II
Ordo: Myrtales

Familia: Myrtaceae
Subfamilia: Myrtoideae
Tribus: Myrteae
Subtribus: Pimentinae
Genus: Psidium
Sectio: P. sect. Calyptropsidium
Species: Psidium friedrichsthalianum

Psidium friedrichsthalianum (O.Berg) Nied. (1893)

Calyptropsidium friedrichsthalianum O.Berg, Linnaea 27: 350. 1856.


Niedenzu, F.J. in Engler, H.G.A. & Prantl, K.A.E. 1893: Nat. Pflanzenfam. 3 (7): 69. Missouri Botanical Garden. 01 Oct 2009 [1].
USDA, ARS, Germplasm Resources Information Network. Psidium friedrichsthalianum in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Psidium friedrichsthalianum, the Costa Rican guava or cas, is a species of guava found mostly in Costa Rica but also grown in Guatemala, Nicaragua and other Central American countries. It can be found in Nicaragua as "guava juice" or "fresco de guava". This fruit is commonly used to prepare a sour and refreshing drink. It has been successfully grown in California now and can be grown from seed in mild higher regions.

It is used as the base for fresco de Cas, in which Costa Ricans mix it with sugar and water and sometimes add cream for a slightly acidic fruit drink.[1]

The cas fruit was described by Otto Karl Berg in 1893.

"Archived copy". Archived from the original on 2011-07-08. Retrieved 2009-08-28.

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