Brassica rapa

Wildflowers Dicots Eudicots Rosids Brassicales Brassicaceae Brassica

Field mustard. Non-native, an invader from Europe. Found along roadsides, on our mesas, and on the lower reaches of most trails.

Easily confused with black mustard (Brassica nigra), the best way to distinguish is to look at the upper leaves, in B. rapa these leaves clasp the stem, while in B. nigra they do not.

Blooms all year but it is at it’s peak Jan-Feb. In most places black mustard predominates except at the bloom peak.

These leaves do clasp the stem.
While those of B. nigra do not.


5 Responses to “Brassica rapa”

  1. Annie Says:

    This is the best full plant picture of field mustard that I’ve found on the web. I was wondering if I could get your permission to use it in a Plant Fact Sheet I’m writing for the species? It would be freely available to the public on the PLANTS website ( Thanks!

  2. Annie Says:

    Great, thank you so much. I’ll credit you in the caption.

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