genus rhododendron: large genus of evergreen shrubs native to cooler regions of the northern hemisphere having showy flowers
dilleniid dicot genus: genus of more or less advanced dicotyledonous trees and shrubs and herbs
glossopharyngeal nerve: sensory nerve to the pharynx and back of the tongue; motor fibers innervate muscles that elevate the pharynx and larynx; includes parasympathetic fibers to the otic ganglion