The effectiveness of geographical isolation, ecological isolation, temporal isolation, mechanical isolation, ethological isolation, cross‐incompatibility, hybrid inviability, hybrid sterility and hybrid breakdown as practical barriers to gene flow in the field between Conospermum taxifolium, C. ericifolium, C. ellipticum and C. longifolium has been quantified. The barriers to gene flow between C. ericifolium and C. ellipticum are completely effective, owing to their allopatric distributions. The barriers to gene flow between C. taxifolium and these two species are only partially effective, as their ecological separation breaks down in intermediate habitats, and partially‐fertile F1 plants can grow in the areas of overlap. The barriers to gene flow between C. longifolium and the other three species are almost completely effective, as cross‐incompatibility is very high and the F1 plants are female‐sterile.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.