sentences:  Lawrie Johnson and Barbara G. Briggs grouped "Helicia" with "Xylomelum" in the subtribe Heliciinae, tribe Helicieae, and subfamily Grevilleoideae in their 1975 monograph "".However, genetics studies showed these two to be relatively unrelated, instead finding the closest genetic correlations between "Hollandaea" and "Helicia", and therefore classifying them both in the subtribe Heliciinae within the tribe Roupaleae.