Observations on Growing Tip Differentiation of Elymus canadensis L. Identification of Chromosome and Fertility of BC1 between Elymus canadensis and E.cylindricus RAPD analysis of Elymus canadensis,Elymus sibiricus and its hybrid F1 Callus Induction and Plant Regeneration in F1 Hybrids of Elymus canadensis × E. dahuricus and E. cylindricus Growth and Morphology Characters of Elymus canadensis, Elymus sibiricus and Their Hybrid RAPD Analysis of Elymus canadensis,E.excelsus and their Hybrid F1 Characteristics of Megaspore and Microspore Development and Flowering Habits of New Elymus canadensis L. Strain