missouribotanicalgarden.org. Retrieved 2021-12-22. "Figure 1: Distribution map of Synandreae in North America". doi:10.7717/peerj.2220/fig-1. {{cite journal}}: Cite...
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Families Scheen, A. C., et al. (2008). Molecular phylogenetics of tribe Synandreae, a North American lineage of lamioid mints (Lamiaceae). Cladistics 24(3)...
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