Psychotria erythrophylla M.-Arg., Flora 59: 542, 546. 1876; Mart. Fl. Bras. 6(5): 328. 1881.
The following specimens are intermediate between typical var hoffmannseggiana and var erythrophylla, with leaves narrower than in typical var hoffmannseggiana but with the shorter peduncles and short axes of the heads of var hoffmannseggiana. VENEZUELA. Bolívar: Pinkus 70 (second sheet). Amazonas: Williams 14926 (Boca del Cano San Miguel, Rio Guainia, Alto Rio Negro. BRITISH GUIANA. Membaru-Kurupung trail, Maguire & Fanshawe 32361.
In his key Müller-Argoviensis (Mart. Fl. Bras. 6(5): 321. 1881) distinguishes this taxon (P. erythrophylla) from the related “P. barbiflora” by the “pedunculi graciles et glabri” as contrasted with “pedunculi breves et breviter vestiti.” Moreover, he gives the length of the peduncle in P. erythrophylla as 2-2.5 cm. An examination of the type specimen from K shows glabrous peduncles on the upper specimen (with fungus hyphae on one of them), while on the lower specimen the peduncle and its rays are minutely puberulent. Moreover, the peduncles measure 3.7-4 cm long.
This taxon resembles some of the narrow-leaved variations of P. phaneroloma Standi. & Steyerm. (P. spicata of Benth.), but has narrower, linear to linear-ligulate involucral bracts which are longer than the diameter of the head, whereas the bracts subtending the heads of P. phaneroloma are broadly ovate-suborbicular to obovate-spatulate, rounded at the apex, and shorter than the diameter of the head.