 A study of 11 species showed significantly higher seed production in thrum than pin morphs of "A. aristatum", "A. lavarum", and "A. vernicosum", and a similar tendency in all other sampled species.In contrast, pin morphs of "A. lavarum" cross pollinate more efficiently than thrum morphs, thus transmitting more of their genes to the next generation via pollen than seed.As better exporters of pollen to flowers of the opposite morph, long-styled "A. lavarum" give rise to disassortative pollen flow and a division in reproductive functions between the morphs.