A little desert plant, from six to twelve inches tall, with branching stems; pale, yellowish-green, downy leaves, about an inch long, with wavy or toothed margins; small white flowers and funny little seed-pods, sticking out at right-angles from the stem. This grows at an altitude of three to four thousand feet and is found in the Petrified Forest.

There are many kinds of Streptanthus, difficult to distinguish, smooth plants, often with a "bloom"; stems branching; leaves often clasping at base, the lower ones usually more toothed or lobed than the upper. The flowers are very peculiar in shape, not like most Mustards, but suggesting the shape of a Bleeding Heart flower; the sepals usually colored like the petals, two or all of them bulging at base, so that the calyx is broad below and contracted above; the corolla regular or irregular, the petals purple or white, with claws and narrow, wavy or crisp borders; the stamens four long and two short, or in three unequal pairs, the longest pair often united below; the pods long, narrow, flatfish or cylindrical, on a broad receptacle; the seeds flat and more or less winged. These plants are called Jewel-flower, but the name does not seem particularly appropriate.

Dithyrea Wislizeni.

Dithyrea Wislizeni.