adjective Botany.
having the root perennial but the stem annual, as perennial herbs.
Also, rhizocarpic [rahy-zoh-kahr-pik] .

1825–35; rhizo- + -carpous

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World English Dictionary
rhizocarpous (ˌraɪzəʊˈkɑːpəs)
1.  (of plants) producing subterranean flowers and fruit
2.  (of perennial plants) having roots that persist throughout the year but stems and leaves that wither at the end of the growing season

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