Adjective
Having the nature or habit of a rhizome or rootstock.
Source: Webster's dictionaryAll of the species are rhizomatous aquatic herbs with a broad leaf base and large showy flowers. Source: Internet
In addition, many can be propagated from leaf cuttings or even sections of leaves, particularly the members of the rhizomatous and rex groups. Source: Internet
Mentha L. In: Stace, C. A., ed. Hybridization and the flora of the British Isles page 387. It is a herbaceous rhizomatous perennial plant growing to convert tall, with smooth stems, square in cross section. Source: Internet
Tarragon has rhizomatous roots and it readily reproduces from the rhizomes. Source: Internet