| Noun | 1. | genus Grindelia - large genus of coarse gummy herbs of western North and Central Americaasterid dicot genus - genus of more or less advanced dicotyledonous herbs and some trees and shrubs gum plant, gumweed, rosinweed, tarweed - any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | |