A new study reveals that two tree species, the American Tulip Tree (Liriodendron tulipifera ... between the primary cell wall (which forms bark, leaves, and growing tissues) and the cell membrane.

The experts also speculated that the Liriodendron tulipifera and Liriodendron chinense, which are two species of tulip tree, emerged on our planet around 30 to 50 million years ago, coinciding ...