The differences in flowering behaviour and mechanisms that promote pollination are described. The pollen counts and frequent visits of calliphorid flies and halictid bees suggest that these are the most likely pollinators in L. spinosa followed by eumenid wasps and tachinid flies. Species of Trigona bees collected in the flowers of L. distans and L. peltata had high pollen loads. They were present during both anthesis and the receptive phase of the flowers and are probably responsible for pollination.