Abstract: The GMA semi-thin section method and comparative was used to analyze the fruits and seeds microstructure of 8 genus 25 races of Trib. Lepidieae. The forming process of the pseudoseptum was described in detail by taking the example of Thlaspi arvense. The fruits and seeds of the Trib. Lepidieae have obviously micromorphological characteristics that are silicle, except the types of fruit flattening of Pachypterygium and Pugionium are dorsal others are both sides; The edge of the fruit with wings is typical characteristics of Trib. Lepidieae. It can be divided into four types:surround wing, tiny wing, wide wing and lance shaped wing. Some pericarp cells have fibrous layer and occasionally lignification, and the others have pseudoseptum except Isatis, Pachypterygium and Pugionium. The seeds size are (0.8-10) mm×(0.5-2.8) mm which coats ornamentation is abundant, and generally, sticky seeds can be formed when exposed to water or damp environment. Testa is usually composed of parenchyma cells with occasional lignification and often contains inclusions. Arrangement of cotyledons and radicals are incumbent except Megacarpaea and Thlaspi. The pseudoseptum is formed by connecting endocarp cells to extend inward. The information of the fruits and seeds microstructure of Trib. Lepidieae are perfected, which will provide basic information for other related researches such as molecular systematics.

Key words: Trib. Lepidieae, fruit, seed, morphology