Whilst working on the Rubiaceae for Flora Malesiana Prof, van Steenis brought to my attention the publication of Gagnepain of the genus Quiducia which seemed to occupy a most anomalous position in the tribe Psychotrieae. On examining the type material it soon became apparent that Quiducia represents a species of Silvianthus (Carlemanniaceae/ /Caprifoliaceae and is conspecific with the species described by Airy Shaw; the slight descrepancies between the two species as regards the placentation must be considered as faulty observation by Gagnepain.