Boyd’s Bible Dictionary:
(butterfly-leaf). The white poplar supposed to be meant (Gen. 30:37; Hos. 4:13).
Concise Bible Dictionary:
Populus Alba (White Poplar) Leaves
It was probably the white poplar (Populus alba) which Jacob employed: it was “green” in the sense of being fresh, moist. The poplar affords a grateful shade from the heat of the sun and was therefore one of the trees chosen under which the Israelites burnt incense (Gen. 30:37; Hos. 4:13). Some judge the Hebrew word libneh to refer to the “storax tree” (the styrax officinale) which also grows in Palestine.
Populus Alba (White Poplar)
The Storax Tree