Relative Abundance of Stomata in Citrus and Some Related Genera

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Abstract
The abundance of stomata in 40 varieties of Citrus and 12 related genera appears to be related to the place of their origin, although the trees studied grew in the same orchard at Riverside, Calif. Citrus species which are natives of the tropics had usually more than 500 stomata per square mm. while those of extra-tropical origin had fewer. The species and varieties showing greatest resistance to cold generally have a low stomatal density, although there are a few well-marked exceptions. The density of stomata is related more closely to the rainfall during the spring months, in which the leaves develop, than to the total annual rainfall, although other climatic factors must be considered.

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