[Tansymustards: The Genus Descurainia 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.
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'.
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Tansymustard ? from The Dalles Airport, Dallesport, WA.........June 16, 1990.
Paul Slichter