|Scientific Name||Descurainia sophia L.|
|Synonyms||Sisymbrium sophia L.|
|Common Names||English: Tansy mustard, flixweed, German: Sophienkraut, French: Sagesse-des-chirurgiens|
|Description||Annual, over-wintering, seed-propagated weed with ramified taproot. The plant is slightly poisonous.|
Much divided leaves, densely pubescent stems, and ascending long fruits.
Elongate, leaf tip obtuse, 3 - 6 mm (0.12 - 0.23 inch) long, short-petiolate, lower part covered with rare, thin hairs.
Erect, often branched above, stretched-ramified.
Plants are 20 -50 cm (7.87 - 19.68 inch) tall.
Alternate, sessile, basal with auricles, bi- tripinnatisect, with lineal- lanceolate lacinules, fine gray or whitish pubescent, linear or broadly ovate.
Bright yellow to whitish.
Peduncles 2-3 times longer than sepals.
Petals(4) pale-greenish-yellow, 1.5 - 2.5 mm (0.059 - 0.098 inch) long, in elongated clusters (racemes).
Late spring - middle of autumn.
Silique to 2.5 cm (0.98 inch) long, 1 mm (0.039 inch) in diameter, many seeded.
Pedicel up to 1.5 cm (0.59 inch) long, filiform.
Germination in spring and autumn.
Viability of Seeds
Up to 4 years.
110,000 - 770,000 seeds/plant.
Germination depth up to 3 cm ( 1.18 inch).
Waste ground, disturbed sites, roadsides, railroads.
Common on various, especially sandy and light soils.
D. sophia originates from North America and is a troublesome weed in cultivated lands, grain fields, oil seed rape and disturbed areas.
The weed is toxic to livestock.
Useful non-chemical contribution to Integrated Weed Management
Competitive crops and mulching reduce emergence of tansy mustard.
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