White Mustard is an introduced, annual plant which grows to a height of 150cm. It has bright yellow flowers - 15-25mm - with 4 regular petals, 4 spreading sepals and 6 stamens, 4 long and 2 short. The flowers are borne in elongating racemes. The leaves are alternate, stalked, coarsely hairy and pinnately divided with the terminal lobe the largest. It has distinctive seedpods which are cylindrical with flattened beak and white hairs. It grows on arable and waste ground and is most commonly found in the Waterford-Cork region. It belongs to the Cabbage family.
I first recorded this plant near Slade, Co Wexford in 2012 on a walk with the BSBI Vice-county recorder for Counties Waterford and Wexford, Paul Green.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre