B. juncea may refer to:
- Baccharis juncea, a New World plant
- Baumea juncea, a rhizomatous herb
- Bebbia juncea, an aromatic shrub
- Belonogaster juncea, a paper wasp
- Bouteloua juncea, a true grass
- Brassica juncea, a mustard plant
This disambiguation page lists articles associated with the same abbreviated species scientific name.
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