The Turnera scabra has two types of flowers: long-styled and short-styled, in which both reject their own pollen distinctly, preventing self-fertilization.[2][3]
^Safavian, D.; Shore, J. S. (2010). "Structure of styles and pollen tubes of distylous Turnera joelii and T. scabra (Turneraceae): are there different mechanisms of incompatibility between the morphs?". Sexual Plant Reproduction. 23 (3): 225–237.
^Tamari, F.; Athanasiou, A.; Shore, J. S. (2001). "Pollen tube growth and inhibition in distylous and homostylous Turnera and Piriqueta (Turneraceae)". Canadian Journal of Botany. 29 (5): 578–591.