There are about 1776 species of the seed plants in the flora region of NE. China, be-longing to 116 families and 575 genera. The flora is temperate in nature. It has the wide connec-tion in geographical relationships, and it is closely related with rest E. Asia (especially with Japan). It is obvious in horizontal and vertical vicariance. The flora is composed of temperate elements, frigid and subfrigid elements, and tropical elemends.The principal part is the temper-ate elements which include many E. Asia by north elements. North Temperate elements and other temperate elements. The flora origin is not after the Tertiary Period.

Based on the floristic concept, the real meaning of tropical and subtropical Dian (Yunnan) -Qian (Guizhou) -Gui (Guangxi) are the Dian-qian-gui region under the Holarctic Kingdom and the Tongking Gulf region under the Paleotropic Kingdom. The former possesses ca. 6276 species in 1454 genera and 248 families, it is subtropic in nature but has strong features of the transition from temperate to tropical flora. The latter has ca. 4303 species in 1294 genera and 248 families and it is northern tropical edge in nature. According to the distributions of characteristic taxa and endemic taxa, the differences of vegetational zones and other azonal factors, these two regions can be classified into four floristical grade: kingdom, subkingdom, region, subregion. Dian-qian-gui region is divided in-to three subregions: South Guizhou-North Guangxi Subregion, Hon-shui river basin subregion. Southeast Yunnan subregion. Tongking Gulf region is divided into two subregions: Southwest Guangxi subregion, South Guangxi subregion. Three significant natural phenomena concerning above mentioned regions and subregions are discussed: 1. The Karst landforms widely develop, 2. they are paleoflora and are very complex in especial rich in tropical families, genera and species, 3. they are especially rich in endemic genera and species.

East China is a natural floristic region. It's seed plants flora has about 4259 species (not including cultivated plants and varieties) in 1180 genera and 174 families. Among them there are about 8 families, 22 genera, 34 species in Gymnospermeae; 25 families, 258 genera, 833 species in Monocotyledoneae and 141 families, 900 genera, 3388 species in Dicotyledoneae. The contents of this paper are summarized as follows: 1.The origion of East China flora; 2. The sta-tistics of families, genera and species; 3. The analysis of big families (Containing more than 60 species); 4. The analysis of geographical elements in genera; 5. The analysis of endemic species and non-endemic species; 6.The floristic comparison in seed plants between East China and Japan.

6390 species of native seed plants (belonging to 1279 genera in 207 families) in the floristic region of Central China were reported here. The statistics and comparatively intensive analysis at different levels, as familiar, generic, and specific respectively were given. Based on the statistics, the results show that both temperate and tropical distribution types are acounted for considerable proportion of the total, but the former is a little more important than the later. The North Temperate, the E. Asian (especially Chinese) endemics.and E. Asia-N. America disjuncted patterns are more concentrated in this area.

This paper deals with the floristic statistics, analysis, regionalization and studying on the floristic origion of the seed plants in the North China Region (excluding Qingling Mts.)There are five main conclusions as follows: (1) North China is the richest region of the north part of China in flora with about 3358 species belong to 151 families and 919 genera. (2) It is chiefly temperate in nature and has a certain transitional nature with tropical and subtropical flora, for it has more than 66 of various temperate elements and about 24 of tropical ele-ments. (3) It has a lower level ofendemism with only 8 or 10 genera, about 600 species and vari-ety endemic to this region, that is only 10 and 15 of the total of the genera and species. (4) According to the structure of geographical elements of species, the distribution of local endemic species and some physiogeographical features, the region may be floristically divided into 4 subregions and 11 districts: subregions of Liaodong-Shandong Peninsula, North China Plain, North China Mountain and Loess Plateau in the northern Shaanxi. (5) Based on the analysis of paleobotanical data and recent floristic data, the origion of this flora in North China may be as-sumed as autochotonous since Tertiary up to date. Besides, many elements are from Northeast Asia, Himalaya and Hengduan Mts respectively, but only a few from Central Asia or arid-re-gion of Northwest China.

There are about 1019 species of the seed plants in the Daxinganling flora region, be-longing to 89 families and 391 genera. The flora is temperate in nature. It is relatively obvious in horizontal and vertical vicariance. It has wide connection in geographical relationships, and it is closely releted with the Siberia, the Arctic zone and the north temperate zone whose distri-bution centre is in Siberia and Arctic zone. The elements of the above-mentioned zone make up the principal part of the flora. They came into the region and developed gradually after the Quaternary Period, and they has a relative short history. The flora is unremarkable in endemicity and young in nature. The comparison with the adjacent flora shows that the flora should be regarded as a independent flora. It is unsiutable to put the flora in adjacent flora such as one of NE. China, Dauria and Zeya-Bureya in Russia.

There are about 1047 species of wild seed plants in the flora subregion of NE. China Plain, belonging to 98 families and 429 genera. According to their present distribution, the gen-era in the flora subregion can be classified into 15 areal-types and 14 subtypes, the species into 25 areal-types and 27 subtypes. Based on the areal-types and the arrangment of the families, the flora is temperate in nature, but it had some connection with tropical flora hostorically. It is unremarkable in endemicity, and shows obviously in the plantcomponent that it has connection with the forest flora in neighbouringmountains and is linked together with the prairie flora in the west. It states clearly that the flora is young and transitional in nature.