Rhamphospermum nigrum

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What Wikipedia says

Rhamphospermum nigrum (syns. Mutarda nigra, Brassica nigra, and Sinapis nigra), black mustard, is an annual plant native to cooler regions of North Africa, temperate regions of Europe, and parts of Asia. It is cultivated for its dark-brown-to-black seeds, which are commonly used as a spice.

Excerpt from the Wikipedia article “Rhamphospermum nigrum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Katrin Schneider / korina.info, CC BY-SA 4.0, via Wikimedia Commons.