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.