CMT: This species is characterized by its well developed but very narrow, shortly petiolate, opposite leaves, its costate stems, its short bilobed stipules, its terminal, cymose, several-flowered inflorescences, its small pedicellate flowers, and its ovoid fruits. In general aspect this species is similar to Psychotria ternata and especially Psychotria taxifolia, and was grouped with them by Bremekamp (1963). This was distinguished from Psychotria taxifolia by Bremekamp based on its 5-merous flowers and stipules with two short lobes and a narrow sinus, vs. 4-merous and with stipules with a truncate sheath and two well developed linear lobes in Psychotria taxifolia. Bremekamp described this species based on two specimens from the same the same or almost the same locality, which were collected by the same person as back-to-back numbers, and these are are assumed here to be from one locality. The exact type locality is unknown to me; the Mad Cat Project has coded this species as found in Zahamena which may be the case if the type locality can be determined, or this may be because the type locality is in the general vicinity of that reserve. Some specimens of Psychotria taxifolia from Zahamena have been misidentified as Psychotria linearifolia, and these may be the source of that report. This species has been confused in herbarium identifications with narrow-leaved species of Chassalia, which have smooth stems, the stipules persistent and becoming yellow and hardened, and sessile flowers.