[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
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.
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.
It is found on open ground from low to middle elevation.
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'.
Tansymustard ? from The Dalles Airport, Dallesport, WA.........June 16, 1990.