Caulanthus crassicaulis
Encyclopedia
Caulanthus crassicaulis is a species of flowering plant in the mustard family
Brassicaceae
Brassicaceae, a medium sized and economically important family of flowering plants , are informally known as the mustards, mustard flowers, the crucifers or the cabbage family....

 known by the common name thickstem wild cabbage. It is native to the western United States where it is a member of the flora in sagebrush
Sagebrush
Sagebrush is a common name of a number of shrubby plant species in the genus Artemisia native to western North America;Or, the sagebrush steppe ecoregion, having one or more kinds of sagebrush, bunchgrasses and others;...

, woodland, and desert scrub habitats. This is a perennial herb producing a stout, inflated stem from a woody caudex
Caudex
A caudex is a form of stem morphology appearing as a thickened, short, perennial stem that is either underground or near ground level . It may be swollen for the purpose of water storage, especially in xerophytes...

 base. The leaves form a basal rosette and occur at intervals along the stem. They are broadly lance-shaped on the lower stem and much smaller and linear in shape farther up. They may have smooth, toothed, or deeply cut edges. The rounded flower has a coat of thick, pouched sepal
Sepal
A sepal is a part of the flower of angiosperms . Collectively the sepals form the calyx, which is the outermost whorl of parts that form a flower. Usually green, sepals have the typical function of protecting the petals when the flower is in bud...

s which part at the flower tip to reveal narrow dark purple or brown petals. There are two varieties of this species: var. crassicaulis generally has hairy flowers, while var. glaber has hairless. The fruit is a long, thin silique
Silique
A silique or siliqua is a fruit of 2 fused carpels with the length being more than three times the width. The outer walls of the ovary usually separate when ripe, leaving a persistent partition...

which may approach 13 centimeters in length.

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