cor·al·root 
(kôrəl-rt′, -rt′, kŏr-)
(kôrəl-rt′, -rt′, kŏr-)n.
Any of several terrestrial, saprophytic, chiefly New World orchids of the genus Corallorhiza having yellowish-green to purplish-brown leafless stems and small flowers.
[From the corallike appearance of its branched rhizomes.]