E. officinalis: annual; stem 2-8 inches high, usually much branched, glabrous or slightly downy; leaves small, sessile, opposite, ovate, deeply toothed, the teeth of the upper ones finely pointed; flowers in loose, terminal, leafy spikes, the corolla white or reddish streaked with purple, and having a yellow spot in the throat. - Heaths and pastures. Fl. July to September.