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. 2014 Dec 22;7:plu090. doi: 10.1093/aobpla/plu090

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Published by Oxford University Press on behalf of the Annals of Botany Company.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Cross-sections of oil glands in petal primordia of sweet orange (Citrus sinensis ‘Valência’). (A) Oil gland cells reacting positively to ferrous sulfate in formalin. (B) Oil gland cells stained with Sudan Black B. (C–E) Distribution of oil glands (arrows) in flower buds 4, 8 and 12 mm long. OG, oil gland.