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Key to Lamium
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40475
4 Leaves all petiolate; [section Lamium]. | |
5 Leaves subtending whorls deeply serrate, with many teeth > 2 mm long; nutlets (2.5-) 2.7-3.0 (-3.3) mm long | |