There Are Bulb Imposters Among Us
Another bulb imposter is a rhizome. It is actually a stem
that grows horizontally under the ground.
Why is it called a stem and not a bulb?
It's because a stem has nodes and internodes. On a rhizome,
the little dimples or sunken areas are the nodes and the
spaces between them are the internodes. Rhizomes include
ginger, iris, asparagus and lily of the valley.
See if you know the difference between a bulb and a tuber
in Mystery #4.