By coal mine museum.
Barbarea vulgaris, Ham Lands
Herbaceous dicot 1.5 ft tall
Leaves alternate, simple, stemless - wraps partially around main stem, coarsely toothed
Flowers yellow in clusters w/ own receptacle
4 sepals, 4 petals, 6 stamens, ovary superior
Barbarea (winter cress or yellow rocket) is a genus of about 22 species of flowering plants in the family Brassicaceae, native to temperate regions of the Northern Hemisphere, with the highest species diversity in southern Europe and southwest Asia. They are small herbaceous biennial or perennial plants with dark green, deeply lobed leaves and yellow flowers with four petals.