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"The Rhizoma or Rootstock grows in a nearly horizontal direction, emitting roots from its under side, increasing by one extremity only, at which it puts forth leaves and flower-stems, and gradually dying at the other. Its surface is generally marked by irregular ridges formed by the bases of decayed leaves."—Darby, 1855

Rhizoma Root

"The Rhizoma or Rootstock grows in a nearly horizontal direction, emitting roots from its under side,…