Comparative study on clonal and sexual reproductive traits of Leymus chinensis populations in different habitats Investigation on Sexual Reproductive Cycle in Torreya grandis Morphological Study on the Sexual Reproductive of the Critically Endangered Fern Isoetes sinensis Study on the Sexaul Reproductive Characteristic of Buchloe dactyloides and Cloning of DREB Transcription Factor Involved in Its Drought Resistance Studies on individual sexual reproductive process of Juglans mandshurica STUDY ON ASEXUAL REPRODUCTIVE TECHNOLOGY OF HIPPOPHAE RHAMNOIDES L.