I recently teased a certain AP biology student about not keeping xylem and phloem straight. Felt like I could do that because I never been able to remember. Anyway, Katie should tell us that it's the phloem extending into the xylem that gives a crosscut of the vine its characteristic pattern. In older times a concoction of this was used to treat yaws. That may be why I thought of Harrison Ford. A plane he was piloting recently yawed onto the wrong runway. Neither yaw is good! These days crossvine is cultivated, and comes in beautiful forms from red to yellow.