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Abstract
Morphological variations of Elynus hystrix L. were found in this study. The typical type of E. hystrix is glumeless, and has loose spikes with spikelets that are horizontally spreading at maturity (type I), while type II has pubescent lemmas and type III possesses lanceolate glumes. In order to investigate the genetic relationships among the three types of E. hystrix, hybridization, genome analysis and Giemsa C-banding were carried out. Meiotic pairing in hybrids from three types of E. hystrix was quite regular, suggesting that the three E. hystrix types have the same basic genome constitution. All of the hybrids could set seed suggesting that reproductive barriers among the three types of E. hystrix were not strong, and they should belong to species of E. hystrix. Giemsa C-banded karyotypes supported the close relationships among three E. hystrix types. It is concluded that accession PI 531616 may not be a pure line of E. hystrix, but a hybrid derivative.