Canthium armatum is a species of flowering plants in the family Rubiaceae.

It is a shrub or tree native to southern Mozambique, Eswatini, and KwaZulu-Natal and the Northern Provinces of northeastern South Africa.

It was first described as Vangueria armata in 1899 by Karl Moritz Schumann.

In 1928 Walter Robyns placed it in a new monotypic genus, Plectroniella.

[2] In 2004, a molecular phylogenetic study showed that Plectroniella armata was related to Canthium ciliatum and species was transferred to the genus Canthium.