摘要：

The longan or "Nhn" (Dimocarpus longanLour., Sapindaceae), a subtropical fruit tree species native fromSouthern Asia is an important crop in Vietnam.There are several popular types of longan in Vietnamsuch as "Nhn lng hng yên" inHung Yenprovince which produces one crop a year, "Nhn tiêu da bò" in Tien Giang province which produces three crops in 2 years or "Nhn xungcmvàng" in Vung Tau province which produces one crop a year. According to Vietnam Ministryof Agricultural and Rural Development (MARD), in 2011 the total of longan cultivation area is close to 100,000 hectares and the production of longan is higher than 600,000 tons (Ministryof Industryand Trade of Vietnam,2012). Most of the longan cultivation area is concentrated in Cuu Long River Delta (Mekong River Delta) with more than 35,000 hectares (MARD, 2011), mainlyin Vinh Long, Ben Tre, Tien Giang or Dong Thap (MARD, 2011). In the north, provinces with large longan cultivation areas include Hung Yen, Bac Giang, Ha Noi, Tuyen Quang, Yen Bai and Hai Duong. Longan is the fifth fruit crop in importance in Vietnamafter cashew, coconut, banana, lychee and rambutan (MARD, 2011). While the reproductive process plays a clear part on the subsequent fruit set, verylittle is known on longan reproductive biology. In this work we describe the basics of longan reproductive biology.

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