Missouri bladderpod is a non-woody, annual plant that produces numerous slender stems from its base. Leaves are less than an inch long and taper towards the stems. Both the leaves and the stems have a dense covering of fine hairs, which gives the plant a silvery-gray appearance.
Blooming period: April-May.
Flowers are typical mustard flowers, with four petals and four sepals. The petals are yellow.
One other Physaria species, spreading bladderpod (Physaria gracilis), occurs in Missouri. Unlike Missouri bladderpod, spreading bladderpod does not have a silvery-gray appearance, and it does not occur within the range of Missouri bladderpod.