This is a medicinal plant that is used to treat nausea, vomiting, and motion sickness. It is a herbaceous, perennial plant that is native to Southeast Asia, but it is now cultivated in many tropical and subtropical regions. It has thick, knotty rhizomes that are used to make ale and beer. It is also used as a spice in cooking. They can be propagated by rhizome division or by seed.
Which of the following rhizomes is best described by the passage given above?