Synostemon sphenophyllus Airy Shaw legitimate | sensu Telford, I.R.H., Pruesapan, K., Welzen, P.C. van & Bruhl, J.J. (29 June 2014), Molecular data consistently recover a 'Queensland clade' of Synostemon (Phyllanthaceae, Phyllantheae) with distinctive floral morphology. Australian Systematic Botany 27(5,6)