T. glabra: annual or biennial; stem two feet or more high, erect, glabrous except a few hairs at the base, usually glaucous; leaves spreading, obovate-oblong, sinuate or pinnately lobed, with a few forked hairs, the upper ones oblong-lanceolate, entire, clasping the stem by pointed auricles; flowers small, white or straw colour; pods long, narrow, erect, crowded in a long narrow raceme. - Banks and roadsides. Fl. June.