Additional origins of Ownbey's Tragopogon mirus

摘要: The allotetraploids (2n = 24) Tragopogon mirus and T. miscellus have become textbook examples of recently recurrently formed allopolyploids. Both species following the introduction three diploids, T. dubius, T. porrifolius T. pratensis (each with 2n = 12), from Europe into Palouse region eastern Washington adjacent Idaho, USA, in early 1900s. parentage both is well documented (T. mirus = T. dubius × T. porrifolius; T. miscellus = T. dubius × T. pratensis), repeatedly past approximately 80 years Palouse. On a larger geographical scale, T. mirus has also been reported Flagstaff, Arizona (AZ), more Oregon (OR). However, populations OR AZ not previously analysed molecular markers to test hypothesis separate origin (vs. long-distance dispersal). Here, we show that collections combine distinctive parental genotypes are genetically differentiated found sample distinct T. dubius contribution forms clade our analyses what referred as T. major (now considered subspecies T. dubius). Consistent other naturally occurring populations, plastid sequences indicate was maternal parent for collections. Microsatellite data consistent local formation co-occurring AZ. As sequence data, samples at microsatellite loci, contributing unique signature this location. It will be useful include these additional origins T. mirus, particularly distant OR, ongoing investigations genetic genomic consequences recent allopolyploidy. © 2012 Linnean Society London, Botanical Journal Society, 2012, 169, 297–311.