a prefix meaning "opposite", "inverse" or "against". When used as a prefix before a word describing the shape of an organ, it means that the organ is attached to its stalk at the opposite end to the usual case.
Copyright:
Mike Bingham, Annette Willemen, Nicholas Wightman, Bart Wursten, Petra Ballings and Mark Hyde, 2011-25
Bingham, M.G., Willemen, A., Wightman, N., Wursten, B.T., Ballings, P. and Hyde, M.A.(2025). Flora of Zambia: Glossary details: ob-. https://www.zambiaflora.com/speciesdata/glossary-display.php?glossary_id=469, retrieved 5 December 2025
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