Citrus depressa

Citrus × depressa
Shīkwāsās on a tree
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Sapindales
Family: Rutaceae
Genus: Citrus
Species: C. × depressa
Binomial name
Citrus × depressa

Citrus depressa (Citrus × depressa, formerly C. pectinifera, Okinawan シークヮーサー or シークァーサー shīkwāsā, Japanese ヒラミレモン hirami remon) or シークワーサー(shīkuwāsā), in English sometimes called shequasar, Taiwan tangerine, flat lemon, hirami lemon, or thin-skinned flat lemon, is a small, green citrus fruit rich in flavonoids and native to Taiwan and Okinawa, Japan.

Very sour, it is often used like lemon or lime to garnish dishes, but is also used to make jam, or a yellow juice, which can be thinned or sweetened.

A bottle of shikwasa juice

Its name is occasionally translated into English as kalamansî, but strictly speaking, this is a different fruit.


Citrus depressa is grown in Taiwan and Ryukyu Islands. This flat lemon is a flowering tree with an average height of 5m. The appearance is similar to Calamondin. The flowers, white and about 3cm in diameter, usually bloom in April. The fruit, which appear around July, weigh about 25~60g. Unripe, the skin is a dark green, which becomes yellow during ripening. The fruits have a very low sugar content and are very sour.

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