Secretory Trichomes, a Substitutive Floral Nectar Source in Lundia A. DC. (Bignoniaceae), a Genus Lacking a Functional Disc

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.