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... a single carpel/style. This doesn't necessarily require that the fruit have a single seed - a carpel can contain multiple ovules, each producing a seed. Apples and oranges, for example, may produce multiple seeds in one carpel.
The reverse implication isn't also necessarily true. A flower with multiple carpels/styles can abort all but one seed. This occurs, for example, in limes (Tilia)
Even equality of the numbers of styles and carpels is not always true. Malvaviscus has 10 styles and 5 carpels.
One stone in the fruit would be monosperma.
Thank you for putting me right on this. This is how we early members expand our knowledge and only a mistake leads to this further information.
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