| From September 2001 to August 2003, some investigations were given to the Luanheshangyou Nature Reserve and 4000 numbers seed plants or so were collected. These conclusions are drawn from the comprehensive investigation and analysis about the flora. 797 species (including subspecies taxa) belonging to 372 genera and 90 families are known in this region. The result is based on the data to hand and abundant first-hand field observations. The flora includes 11 species of gymnosperm belonging to 6 genera and 3 families, as well as 786 species of angiosperm belonging to 366 genera and 87 families (657 species of dicotyledon and 129 species of monocotyledon). 2 species, Caragana intermedia Kuang et H. C. Fu and Pulsatilla cernua (Thunb.) Bercht. et Opiz., as new records to Hebei Province are discovered during the research. 15 dominant families consist of 525 species and 227 genera, with over 22 species in each one. These figures represent about 16.7%, 61.0% and 65.9% of the corresponding statistics for the local seed plant flora. 6 dominant genera with over 10 species in each one take 1.6% of the total local genera and 11.5% of the total local species. 4 monogenus families share 4.4% of the regional total families. Local monogenus families are abundant. In all 43 ones are found there. That reflects the comlexity of the flora. 13 monotypic genera take 3.5% and 23 oligospecies genera take 6.2% of the local total genera. This is the archaic trait of the regional flora's origin.According to the approach about the division of life form by Drude, the style of seed plants in the region can be devided into tree, shrub, vine, etesiae, biennial plant and annual plant, etc. There are 632 species of herbaceous plant in the flora. The number is prominent. That is the distinctive charater of vegetations in the north temperate region.On the base of the opinion of Professor Wu Zheng-Yi (1991) about the areal-types of genera of China seed plants, the 372 genera in the region fall into 15 types. 47 (12.6%) of the 372 indigenous genera (with a worldwide distribution excluded) are of tropical occurrence (2-7) in their distribution. 154 genera including 419 species belong to North temperate, sharing 48.1% of regional total genera. The type takes the first position in the 15 ones. This appears to reflect distinctive temperate trait of the flora. The existence of some tropic types shows the tropic origin of this flora in a way.According to the ordination of R/T (tropic genera / temperate genera), the ratio of R/T takes on a descendant trend, as the increasing of latitude to the data of 11 areas and an apparent rule on latitude zonation of floristic variation was expressed. The similar result was obtained through the caculation of shared genera and generic similarity index between these 11 floras. Quantitative analysis on the floristic spectrum by PCA was used in the paper. The results show that the Luanheshangyou Nature Reserve is closest to the Xiaowutaishan Nature Reserve but farthest to the Dunhuang Nature Reserve in generic composition.The Luanheshangyou Nature Reserve is a favorable location for resource plants. According to their utilization, resource plants may be grouped into 2 categories: those used as raw materials and those used as non raw materials. Based on the investigation, the Luanheshangyou Nature Reserve has 713 species of resource plants (these are derived from the sum of the numbers of plants appearing in individual lists ) which are devided into 13 categories. There are 58 species of fiber plants, 53 species of starch and sugar plants, 62 species for oil, 38 species for fruit, 70 species for vegetable, 18 species for beverage, 100 species as medicinal plants, 75 species for agricultural medicine, 50 species for fragrance, 63 species for tannin, 6 species for resin and rubber, 41 species as honey resource, 79 species for fodder. In addition, a large number of non raw material resource plants inhabit the region, including soil-improving plants and those for germ plasm or floriculture, etc.According to the distribution,...
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