When was brome flat-eared introduced into my country?

Alternative names of Brome aestivum: American Brome, North American Brome, Australian Brome, and Wild Wheat; among the brome grasses, Brome aestivum is an important cultivated grass native to South America. . In the past relevant literature at home and abroad, its scientific name has always been Bromus.catharticus.Vahl. This was named and published by M.H. Vahl in 1791 based on specimens collected from Peru, South America. In "Flora.europeae.Vol.5" published in 1980, P.M. Smith concluded that the correct scientific name of this plant should be Bromus.willdenousii.Kunth, while B.catharticus.Vahl and B.unidoides.Kunth should be Its synonym. This plant is naturally distributed in South America and is particularly common in Uruguay, Argentina and other countries. It was introduced to the United States from Argentina in the 1860s, and later spread to other parts of the world. Since the 1940s, the United States, Argentina, New Zealand and other countries have bred a large number of excellent cultivated varieties, such as Texas, Lamont, Gase, Pergamino, Amgel, Gallardo, Matua, etc., in the United States (South), Australia (South) ), New Zealand, Brazil (southern), Argentina, Uruguay and other countries are planted on a large scale. It has also been planted in some countries in southern Europe; it is also expected to be planted as an important pasture in high-altitude areas of Kenya. The history of introduction and cultivation in my country is relatively late. It was not introduced to Nanjing until the 1940s, and later it was introduced to Inner Mongolia, Xinjiang, Qinghai, Beijing, Yunnan, Guizhou, Sichuan, Guangxi and other places for cultivation. Escape species are often found in areas where they have been introduced and cultivated, especially in subtropical areas.