hercules-club(n = noun.plant) hercules'-club, hercules'-clubs, zanthoxylum clava-herculis - densely spiny ornamental of southeastern United States and West Indies;
is a kind of prickly ash
is a member of genus zanthoxylum, zanthoxylum

1.  A densely spiny ornamental tree (Zanthoxylum clava-herculis) of the rue family, growing in southeast U. S. and West Indies.
"It belongs to the same genus as one of the trees (Zanthoxylum Americanum) called prickly ash." [1913 Webster]

2.  A small, prickly, deciduous clump-forming tree or shrub (Aralia spinosa) of eastern U.S.; also called Angelica tree and prickly ash. [1913 Webster]

3.  A variety of the common gourd (Lagenaria vulgaris). Its fruit sometimes exceeds five feet in length. [1913 Webster]