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View of this prolific weed from eastern Asia.
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- Flowers with 4 petals, 4 sepals & 6 stamens: mustard family (Brassicaceae).
- Perennial weed of lowlands and marshes.
- Fruit a silicle, not an elongated silique.
- Silicle round to ± flat in cross section and sometimes inflated (Group 2).
- Leaves entire to shallowly lobed.
- Upper leaves with clasping base.
- Hairs 0, simple or branched. [Keys out under all of the above.]
- Silicle ± indehiscent.
- Sepals & silicles glabrous.
- Silicle not heartshaped (cordate).
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