Brassica rapa
is similar to Sinapis
arvensis in general habit, but:
- beak of the pod is seedless and needle-like
- stem lacking short stiff downward directed
hairs
- upper stem leaves half to completely clasping
stem
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Sinapis arvensis
(the species we are looking for!)
- has a seed in the beak of the pod (in addition to
those within the valves)
- stem with short stiff downward directed hairs
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