[The Mustard Family East of the Cascade Mts. of Oregon and Washington]

Blue Mustard, Chorispora, Crossflower, Purple Field Mustard

Chorispora tenella

Synonyms: Chorisporum tenellum, Raphanus tenellus

Flower of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

The photo above shows a close-up of the flower of blue mustard as seen from Wilson Creek, BLM lands about 10 miles southwest of Wilbur, WA...........April 30 2,007.

Pods of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)The photos on this page show the pod and flowers of Chorispora tenella about 20 miles SW of Toppenish, WA.........early May, 1997.
Characteristics:

Blue mustard is a leafy, spreading, annual, branched from the base, and rising from 10-50 cm in height. The herbage, as seen in the photo at right, consists of stalked glands. The leaves are oblanceolate to elliptic-oblong, with sinuous or coarsely-toothed leaf edges. The lower leaves are petiolate, the uppermost are sessile, with the blades from 3-8 cm long. The leaves are nearly entire to sparsely toothed.

The sparsely flowered racemes are elongated, with the lower flowers from the axils of the upper leaves. The narrow, tubular calyx is 6-8 mm long. The pedicels are short and stout. The pale purple flowers each have 4 narrow petals about 6-8 mm long. The siliques are widest at the base, narrowing gradually to a point at the tip. They are about 3.5-4.5 cm long, arched, and spreading or ascending (See photo at right.).


Habitat:

Blue mustard is found in cultivated areas where it reduces crop yields, and in open, disturbed places.


Range:

Although it is a native of Russia and southwestern Asia, it is now established as a weed in the drier inland parts of the Pacific Northwest.


Importance:

Blue mustard is a weedy species which has a disagreeable odor which may be transferred to the milk of dairy animals when they eat the plant.


Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

The photo above shows the upper stem of blue mustard as seen near the Odessa Craters near Odessa, WA........April 28, 2007.

Close-up sideview of a flower of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

The photo above shows a close-up sideview of the flower of blue mustard as seen near the Odessa Craters near Odessa, WA........April 28, 2007.

Close-up of a curved pod of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

The photo above shows a close-up of the seed pod of blue mustard as seen near the Odessa Craters near Odessa, WA.........April 28, 2007.

Ventral surface of a stem leaf of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

The photo above shows the underside of a stem leaf of blue mustard as seen near the Odessa Craters near Odessa, WA.........April 28, 2007.

Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

Blue mustard as seen along the Hard Stone Trail at Cottonwood Canyon State Park on the west bank of the John Day River.........March 19, 2017.

Close-up of the inflorescence of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus) - Close-up of the inflorescence of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

Basal leaf of Blue Mustard, Chorispora, Crossflower, Purple Field Mustard: Chorispora tenella (Synonyms: Chorisporum tenellum, Raphanus tenellus)

Additional images of blue mustard as seen near the Odessa Craters near Odessa, WA..........May 8, 2012.

Paul Slichter