Comparative anatomy of putative secretory floral structures in the Camaridium cucullatum complex and Nitidobulbon (Orchidaceae: Maxillariinae)

Most members of the Neotropical orchid subtribe Maxillariinae lack floral rewards (e.g. nectar, food-hairs, resin or wax) and attract pollinators by food- or sexual-deceit. Of those that produce floral rewards, relatively few produce resin. Members of the Mexican and Central American Camaridium cucullatum complex are considered to be entirely rewardless. Here, we demonstrate that they produce lipoidal or resin-like labellar secretions. They are...