Genus Lespedeza has been utilized as animal forage, honey tree, fiber resource and raw material for rural commodities. It grows well in the devasted area because of its nitrogen fixing ability. Because a lot of Lespedeza species has been planted in the eroded area, many species from different area have been mixed with the native species and many hybrids have been producted, much confusion has been arisen in the identification and the classification of the genus Lespedeza in Korea. This study aimed to make clear-cut identification among species, hybrids and varietys etc., to find out the parent species of the putative hybrid, to find out relative similarity among species, to predict the direction of future speciation of Lespedeza speies in Korea. The experimental materials were obtained from the Forest Research Institute, the Institute of Genetics and the others collections throughout the country. The study on the genus Lespedeza resulted in: 1. By the survey of distribution area for Lejspeadeza spp., it was found out that the Lespedeza is distributed all over the country, a castal region and partial area. 2. The flowering time of Lespedeza spp. is separated two parts, one is the time pre-Aaugust, another is the time pro-August, and first opening flowering spp. is L. maximowiczii, latest opening flower spp. is L. maritima, and all Eulespedeza spp. flowering is proAugust. 3. L. macrocarpa is ray diffuse wood, L. thunbergii var. intermedia is diffuse porous wood and others are ring porous wood in the cross section. The statistical analysis with the measurement of length, width, wall thickness of vessel and wood fiber showed that there is high significance among spp. but no significance among locality. 4. Pollen is single grain, a slightly long globular shape, its Eulespedeza is slightly Large than its Macrolespedeza. There are sculptured as FLC (Funel Like Concavity) on the surface of the pollen grain. There are differences in size among spp. according to the degree of evolutionary developing FLC on the pollen grain surface. L cyrtobotrya is estimated to most primitive spp. 5. The observation of the chromosome numbers and shape at the roottip under the light microscope showed that its Macrolespedeza spp. and its L. virgata of Eulespedeza are 2n = 22, others of Eulespedeza are all 2n = 20. 6. The isozyme analysis 49 samples of 24 Lespedeza spp. for 4 enzymes (PER, GOT, LAP, MDH) approved the parent of putative hybrids and that there are many different genotypes among morphologically similar phenotype. 7. The analysis of phenolic compounds for 54 samples of 25 spp. by liguid chromatography also approved the parent of putative hybrids. 8. The basic species have very high stainability, and the hybrids are very irregularly high and low stainabaility. 9. tt was found out that there are stomata on surface leaf of Eulespedeza spp., 10. The phenogram from the cluster analysis with the measurement of leaf, inflorescense, stall;, shoot, pod, seed, root characters for 16 spp. Macrolespedeza and 7 spp. Eulespedeza showed the relative similarity among the spp. 11. Compylotropis macrocarpa differs from Macrolespedeza and Eulespedeza in the following ways, the distribution of campylotropis is Sung Ju and Tae Gu area, it`s wood is difuse poraus wood, there is brown patentouse trichome on inflorescence, there is a ring modle unpper and low tip of rachis and it`s length slitly longer than Macrolespedeza and Eulespedeza, upper part of the stalk above root coller is died by the freezing, during winter season, and attached bract at calyxlobe drops before flower opening from the cayxlobe, By this reason, Campulotropis is subgenus. 12. The analysis of the results from isozyme, phenolic compounds analysis and survey of morphological characters approved the parents of putative hybrids that are L. tomentella, L. chiisanensis and L. patentibicolor, L. nakaii, L. schindleri, L. robusta, L. maritima, and L. intermixta, and the L. patentibiolor