Family: Poaceae
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Elymus patagonicus is a hexaploid with the genome constitution of StHH. The two H genomes are somewhat different from each other.
Reference: Douglas R. Dewey. 1972. Genome Analysis of South American Elymus Patagonicus and Its Hybrids with Two North American and Two Asian Agropyron Species. Botanical Gazette 133: 436-443.