Stems: decumbent or ascending, slender, simple. Leaves: spatulate, the basal ones obtuse, entire, narrowed into margined petioles; stem-leaves nearly sessile, acute, much smaller. Flowers: yellow, in terminal racemes. Fruit: pods didymous, variable, with large, strongly inflated cavities, emarginate at base and summit.
Bladder-pod (Physaria didymocarpa)
A most curious and interesting plant, which grows on high rocky slopes and forms patches upon the ground by means of its rosettes of pale green leaves and decumbent stems. The little yellow flowers are cruciform and inconspicuous, and grow in clusters at the ends of the long slender stalks which spring out from below the central rosettes of leaves, while an irregular circle of outer leaves grows beyond them again. It is the large inflated pods, of a delicate gray-green hue, which give this plant its common name and constitute its greatest attraction. They are really exquisitely quaint, and so unusual as to always attract the notice of the passing traveller. The leaves are spatu-late and small. The name Physaria is derived from the Greek, signifying "bellows," and refers to the inflated fruit.