Morphos crack4/16/2023 ![]() Attempts to cluster these variants hierarchically did not reveal an unambiguous pattern of relationship, although several of the techniques used produced the intuitively satisfying separation of the three North American taxa from the Asian variety and the European variety. cordifolius is found in eastern Asia, mainly in Japan. nov.) occurs in the eastern part of North America, and intergrades with the other three varieties populating North America, wherever it is sympatric with them. lupulus occurs in Europe, where it is allopatric, and is introduced elsewhere, especially in eastern North America, where it comprises half of the herbarium plants from this region. neomexicanus occupies western North America, especially the Cordillera, and is largely allopatric. This technique produced five groups, which are formally recognized here as varieties. A method combining alternating cycles of principal coordinate analysis and canonical analysis was used to generate morphologically defined groups, the taxonomic acceptability of which was judged on the basis of geographical homogeneity. ![]() In an attempt to alleviate extensive confusion regarding infra-specific variation of Humulus lupulus (s.l.), numerical taxonomic analyses were conducted on 783 herbarium collections of this species.
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