Cardamine oligosperma is a species of cardamine known by the common name little western bittercress. It is native to western North America from Alaska to California to Colorado, where it grows in moist mountain habitats. This is an annual or biennial herb growing from a taproot. It produces one or more upright, branching stems. The plentiful leaves are divided into many leaflets. The plant generally has a rosette of leaves at the base with leaflets nearly round in shape. The inflorescence is several centimeters long and bears many flowers with white petals just a few millimeters in length. The fruit is a silique up to 2.5 centimeters long.