TUBEROUS

adj. resembling bulbs; having bulbous lumps

Tubers are different types of modified plant structures that are enlarged to store nutrients. They are used by plants to overwinter and regrow the next year and to reproduce. Three different groups of tubers are: potato tubers, stem tubers, and root tubers.
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Adjective
1. of or relating to or resembling a tuber; "a tuberous root"
(pertainym) tuber

(a.)
Covered with knobby or wartlike prominences; knobbed.
  

(a.)
Consisting of, or bearing, tubers; resembling a tuber.
  

Synonyms and related words:
botanic, bulbous, burled, cereal, farinaceous, fruitlike, fruity, gnarled, gnarly, herbaceous, herbal, herbose, herbous, herby, knobbed, knobby, knoblike, knotted, knotty, knurled, knurly, leguminose, leguminous, nodal, noded, nodiform, nodular, nodulated, noduled, nubbled, nubbly, nubby, plantlike, radicated, radiciform, radicular, rhizoid, rootlike, studded, torose, tubercular, tuberculous, tuberose, vegetable, vegetal, vegetarian, vegetational, vegetative, weedy