Essentially, after one growing season, the rhizome can be called a crown. The crown will have both true roots (which do what they do and pretty much grow downward), and also have a bunch of buds. The buds will be located above the true roots and as they grow outward and away from the crown, at a certain point will decide to seek sunlight. Once they break the soil they'll become the shoots that will climb and produce our crop. The portion that grew out from the crown but is still in the ground will turn into a rhizome which will contain the buds and may also have developed some roots. This what we harvest every Spring to make cuttings to start new plants with. Hope you can make some sense of this. Now that class is over we can enjoy another beer!