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Capacity of nectar secretion lost, and re-acquired during evolution
Most members of the Bignoniaceae offer nectar produced by a perigynous disc as a floral reward. A few derived genera, such as Lundia, which has a nectar-sterile disc, adopt an alternative strategy of attraction by deceit. Lopes et al. (pp. 169-174) demonstrate that during its history, at least one species of Lundia has returned to true rewarding, but by producing nectar from corolla-borne trichomes rather than from the perigynous disc.
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