rhizomatous begonia(n = noun.plant) - any of numerous begonias having prominent shaggy creeping stems or rhizomes;
is a kind of begonia

angel-wing begonia, beefsteak begonia, begonia, begonia cheimantha, begonia cocchinea, begonia dregei, begonia erythrophylla, begonia family, begonia feastii, begonia heracleifolia, begonia rex, begonia semperflorens, begonia socotrana, begonia tuberhybrida, blooming-fool begonia, christmas begonia, fibrous-rooted begonia, genus begonia, grape-leaf begonia, hybrid tuberous begonia, kidney begonia, king begonia, maple-leaf begonia, painted-leaf begonia, rex begonia, rhizomatous, socotra begonia, star begonia, star-leaf begonia, tuberous begonia, watermelon begonia, wax begonia