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Japan Lagerstroemia indica Lythraceae crape myrtle is a summer flowering shrubs, with early flowering, long flowering period, dwarf plant type and anti-pollution, etc., widely loved by the people, is now widely used in landscaping. In this study, Japan Lagerstroemia indica as test materials, the flower bud morphological differentiation observed with paraffin method, the development of the size of the spores and the male and female gametophyte formation process. At the same time, by two years with the local cultivation of crape myrtle, Hongwei and silver, Wei comparison test, Japan Lagerstroemia indica adaptability in Wuhan. The results showed that: 1. Japan dwarf crape myrtle flower bud differentiation is the differentiation type items buds and in the upper lateral bud flower bud differentiation from late April to late May ovule primordia, which lasted about 30d, the process can be divided into morphological differentiation, differentiation, inflorescence primordia differentiation, bud primordium, the flower calyx differentiation of, petal differentiation stage, stamen differentiation stage, pistil differentiation stage eight times. Stamen differentiation stage, the fastest pistil differentiation stage differentiation speed, duration of only 3 to 5d to flowers calyx differentiation period from inflorescence primordium differentiation slower. Single flower developmental sequence to the heart, and the the panicle development order from top to bottom, from the inside outward. 2. Lagerstroemia indica, Japan pistil consists of 4 to 6 carpels connate from ovary 4 to 6 rooms, each room with six or seven anatropous, Shuangzhu be thick bead heart. The spores meiosis megasporocyte was linear arrangement. The embryo sac of the the single spore Polygonum shaped embryo sac is. Polar nuclei fusion secondary nucleus before fertilization. 3. Lagerstroemia indica, Japan the anthers 4 rooms, occasionally Room 6; the anther wall by the four-story structure, the outermost layer of the epidermis, within the endothecium, middle and tapetum layer the tapetum in situ degradation, is a glandular type tapetum, anther wall as the basic type, pollen mother cell meiosis continuous tetrad arranged in a tetrahedral newly formed spores exist in the form of varying degrees of shrinkage deformation. The mature pollen - cell type. 4. Compared with native crape myrtle, Hongwei and silver, Wei, Japan Lagerstroemia indica normal growth and development of better ornamental characteristics, strong disease resistance and adversity adaptability and normal reproduction. Use of quantitative evaluation method developed the crape myrtle adaptive evaluation criteria, in accordance with the standards of this score, the introduction of the Japanese the Lagerstroemia indica score for 50 minutes, crape myrtle, of Hongwei and silver Wei scores were 45,45,47, and thus that Japan Lagerstroemia indica in Wuhan has a good adaptability.
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