[The Mustard Family in the Columbia River Gorge of Oregon and Washington]

Cutleaf Tansymustard, Mountain Tansymustard

Descurainia incisa ssp. incisa

Synonyms: Descurainia incana ssp. incisa, Descurainia incisa, Descurainia incisa var. incisa, Descurainia richardsonii ssp. incisa, Descurainia richardsonii var. incisa, Descurainia richardsonii var. sonnei, Sisymbrium incisum, Sophia incisa

Cutleaf Tansymustard, Mountain Tansymustard: Descurainia incisa ssp. incisa (Synonyms: Descurainia incana ssp. incisa, Descurainia incisa, Descurainia incisa var. incisa, Descurainia richardsonii ssp. incisa, Descurainia richardsonii var. incisa, Descurainia richardsonii var. sonnei, Sisymbrium incisum, Sophia incisa)

From left to right: little western bittercress (Cardamine oligosperma), what appears to be cutleaf tansymustard (Descurainia incisa ssp. incisa), and what appears to be streambank springbeauty (Claytonia parviflora) as seen on a boulder field slope along the lower section of the Lyle Cherry Orchard Trail off SR 14, Columbia River Gorge........March 11, 2016.

Characteristics:

Tansy mustard is an annual with some branching of the erect stems which may rise from 20-100 cm high. The lower leaves are pinnate-pinnatifid while those above are pinnatifid with toothed or lobed margins.

The inflorescence is a dense raceme of pale to deep yellow flowers, the sepals being 1-25 long and the petals from 1.5-3.5 mm long. The seed capsules are thin siliques from 5-17 mm long and 1 mm wide, which ascend or are erect.


Habitat:

It is found on open ground from low to middle elevation.


Range:

Tansy mustard is found over much of western North America.

In the Columbia River Gorge, it may be found east of Mosier, OR between 100'-2900'.


Cutleaf Tansymustard, Mountain Tansymustard: Descurainia incisa ssp. incisa (Synonyms: Descurainia incana ssp. incisa, Descurainia incisa, Descurainia incisa var. incisa, Descurainia richardsonii ssp. incisa, Descurainia richardsonii var. incisa, Descurainia richardsonii var. sonnei, Sisymbrium incisum, Sophia incisa) - Cutleaf Tansymustard, Mountain Tansymustard: Descurainia incisa ssp. incisa (Synonyms: Descurainia incana ssp. incisa, Descurainia incisa, Descurainia incisa var. incisa, Descurainia richardsonii ssp. incisa, Descurainia richardsonii var. incisa, Descurainia richardsonii var. sonnei, Sisymbrium incisum, Sophia incisa)

Tansymustard ? from The Dalles Airport, Dallesport, WA.........June 16, 1990.

Paul Slichter