Charlotte Lindqvist and Victor A. Albert (2002), Figure 1, «Origin of the Hawaiian endemic mints within North American Stachys (Lamiaceae)», American Journal of Botany89: 1709-1724, doi:10.3732/ajb.89.10.1709.
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Charlotte Lindqvist and Victor A. Albert (2002), Figure 1, «Origin of the Hawaiian endemic mints within North American Stachys (Lamiaceae)», American Journal of Botany89: 1709-1724, doi:10.3732/ajb.89.10.1709.