The let side of a stem a stem and leaf plot
A stem is thing that hold up the flower. stem can also mean like diverge stems are dis and verge that is what another meaning of stem is.
1. A building, especially one of imposing appearance or size.2. An elaborate conceptual structure (http://www.thefreedictionary.com/edifice)
hold the flower and travels the water through from the leaves and flower
They have a woody stem with thorns. Hope this helps.