Stems and leaves of caulanthus lasiophyllus
may be glabrous or sparsely to densely covered by short, stiff hairs. Basal and lower stem leaves are oblanceolate to lanceolate, lined by irregular teeth, or lobes; upper stem leaves are smaller, less lobed, tapering at the base. Both the hair and leaf characteristics are highly variable.
Flowers are arranged as an elongated, unbranched, terminal cluster, with individual flowers quite well separated. Petals are creamy white to pale pink, with straight margins, while the sepals are green or reddish, about half as long. There are six stamens, two shorter than the other four. Fruits are narrow cylinders up to 2 inches long, generally angled down when mature, attached by short stalks.