From laban; some sort of whitish tree, perhaps the storax -- poplar.
see HEBREW laban
H3839. libneh
לִבְנֶה noun [masculine] poplar (apparently = Arabic ; Ethiopic styrax officinalis; but ᵐ5 λεύκη, compare ᵑ6 and LöwNo.107); — Genesis 30:37 ל ׳מַקַּל וְעַרְמוֺן וְלוּז לַח as marking places of idolatrous incense-burning וְּאֵלָה וְלִבְנֶה אַלּוֺן תַּחַת Hosea 4:13. **named from exuding milky (white) gum De Ges and others.