Brassica juncea aka Mustard Greens

Brassica juncea, commonly known as brown mustard, Chinese mustard, Indian mustard, leaf mustard, Oriental mustard, and vegetable mustard, is an annual herb native to southern and eastern Asia. It has been cultivated for centuries in Europe and Asia and has given rise to a variety of leafy vegetables popular in eastern Asia, such as Chinese mustard greens and Japanese mizuna. This plant features evergreen leaves with a wavy or toothed edge, larger lower leaves on stalks, and smaller narrow upper leaves. Its yellow flowers develop into long green pods containing brown seeds. All parts of the plant are edible when young, and the leaves are commonly added raw to salads or boiled before consumption. Growing up to 1-2 feet tall, it has petiolate basal leaves with lobes and smaller stem leaves. The bright yellow flowers, although not visually appealing, mature to 1.5 inches long. Apart from its use as a vegetable, the pungent seeds of Brassica juncea are used to flavor various dishes, and its seed oil is popular for cooking in Asia. However, this plant has gained a reputation as an invasive weed outside of its cultivated areas and is listed as invasive in several regions, including Michigan, Florida, Alaska, Australia, New Zealand, Japan, the Americas, and many Pacific Islands.