Citrus taiwanica

Taiwan-native Citrus taiwanica "is a vigorous upright spreading evergreen thorny citrus with sour tangerine to orange-like fruits which are ornamental and useful for making very tasty ade drinks." These plants take on the deep green color, pointed oval shaped leaves and thorns of other citrus plants and sprout yellowish-orange citrus fruits slightly smaller (and slightly more sour) than the common orange. More