Citrus depressa (Citrus × depressa, formerly C. pectinifera, Okinawan: シークヮーサー/シークァーサー, romanized: shiikwaasa, Japanese: ヒラミレモン, romanized: hirami remon or シークヮーサー, shiikwāsā, in English sometimes called shiikuwasha, shequasar, Taiwan tangerine, Okinawa lime,[1] flat lemon, hirami lemon, or thin-skinned flat lemon,[citation needed] is a small citrus fruit often harvested and used when green, rich in flavonoids and native to East Asia (Taiwan and Okinawa Islands, Japan).

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

This mainland parent is related to the Chinese Sun Chu Sha mandarin but has small amounts of pomelo introgression that was passed on to the shiikwaasa.

This varied origin, plus the fact that shiikwaasa grow wild and are referred to in some of the earliest poetry of the island kingdoms, suggest that the hybridizations occurred naturally.

Shiikwaasa paste has also been demonstrated to decrease plasma glucose levels in lab rats and human volunteers.