[5][7] The inflorescences are produced either terminally or in the leaf axils, the flowers very small at about 2 mm (0.1 in) diameter.

[3][8] His paper, titled New or Noteworthy Australian Euphorbiaceae was published in the Kew Bulletin.

[5][9] The genus name Cleistanthus is derived from the Ancient Greek words kleistós (closed), and ánthos (flower), and refers to the petals being enclosed by the sepals in some species.

[7] The species epithet hylandii was chosen by Shaw to honour Hyland.

[6][7] This species is listed by both IUCN and the Queensland Department of Environment and Science as least concern.