C. impatiens: annual; stem 1 1/2 foot high, stiff, erect, leafy, simple, or with a few erect branches; leaves pinnate, with numerous lanceolate or almost ovate segments, often deeply toothed; petals very minute, sometimes wanting; pods numerous, about an inch long, the valves rolling back at maturity with much elasticity. - Moist rocks and shady waste places. Fl. May, June. [See also p. 45.]