Complex sentence: A few species were transferred to "Canthium" from "Rytigynia" and other genera in 2004 but the final circumscription of "Canthium" will remain in doubt until phylogenetic studies achieve greater resolution for the clade containing "Canthium coromandelicum" and its closest relatives.
Split into simpler sentences: A few species were transferred to "Canthium" from "Rytigynia" and other genera in 2004. The final circumscription of "Canthium" will remain in doubt until phylogenetic studies achieve greater resolution for the clade containing "Canthium coromandelicum" and its closest relatives.