N. Cataria: stems erect, branching, 2-2 1/2 feet high, hoary with minute down; leaves ovate-cordate, coarsely toothed; flowers rather small, pale blue or nearly white, crowded in compact cymes, forming short, oblong spikes at the ends of the branches. - Hedges, roadsides and waste places. Fl. July, August. [See also p. 61.]