Missouri Plants Black mustard   (Brassica nigra) Tracheophyte: Angiosperm: Dicot: Mustard (Brassicaceae) Non-native plant from Europe Habitat: fields, roadsides, and waste places. ID Features: yellow flowers with variably-shaped leaves. Natural History: Black mustard has very small yellow flowers and its leaves are variable, usually irregularly lobed. Mustards are the plants that are used to produce the condiment known as "mustard".

The information is from: Missouri Wildflowers by Edgar Denison, 5th Edition, Missouri Department of Conservation, ©1998.