The Collaborative International Dictionary of English v.0.48:
goldenrod \gold"en*rod`\, golden-rod \gold"en-rod`\(g[=o]ld"'n*r[o^]d`), n. (Bot.) A tall herb (Solidago Virga-aurea), bearing small yellow flowers in a graceful elongated cluster. The name is common to all the species of the genus Solidago. [1913 Webster] Golden-rod tree (Bot.), a shrub (Bosea Yervamora), a native of the Canary Isles. [1913 Webster]