Decussate! That’s what Purple Deadnettle is … Decussate. As long as I’m putting plant pics up, I might as well throw in some botanical terms. So, the first one is “Decussate”.
Decussate simply means that the opposite pairs of leaves are 90 degrees offset from the pairs above and below them. That’s how botanists talk when they talk to each other. Another opposite leaf term is “Distichous”. This means that the sets of opposite leaves are in the same plane, giving the appearance of two rows of leaves. Far fewer plants have distichous leaves than have decussate leaves, although most compound leaves have distichous leaflets.
So, there’s your botany lesson for today.