Loose-skinned mandarins that peel by hand, ripe from October to December. Mostly eaten raw, and also canned or candied; the dried peel of some kinds becomes the seasoning 陈皮.
Southern Chinese like to buy tangerines for Chinese New Year.
Tips
culture
橘子 and 桔子 are interchangeable. Tangerines are lucky fruits for Chinese New Year because 橘/桔 sounds like 吉 (lucky). In Cantonese, 柑 (mandarin orange) sounds like 金 (gold). That's why you see piles of oranges everywhere during Spring Festival.