Monographs Details: Psychotria loretensis Standl.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Description:Distribution and Ecology - Distribution. Amazonian Peru and Brazil. PERU. Loreto: Balsapuerto, lower Río Huallaga basin, alt 350-550 m, 29 Aug 1929, Killip & Smith 28542; Mishuyacu, near Iquitos, alt 100 m, 24-28 Sep 1929, Killip & Smith 29862; Balsapuerto, lower Río Huallaga basin, alt 150-350 m, 28-30 Aug 1929, Killip & Smith 28398, 28388, 28606; Iquitos, alt 100 m, 3-11 Aug 1929, Killip & Smith 26988; Mishuyacu, near Iquitos, alt 100 m, Dec 1929, Klug 631. BRAZIL. Amazonas: Municipality Humayta, near Livramento on Rio Livramento, basin of Rio Madeira, 12 Oct-6 Nov 1934, Krukoff 6884.

Discussion:

Type. Iquitos, Dept Loreto, Peru, alt 100 m, 3-11 Aug 1929, E. P. Killip & A. C. Smith 27482.

A number of specimens encountered in herbaria as labelled under the name of this species prove to belong mainly with either P. subundulata Benth. or P. cincta Standi. Because of its thickened marginal leaf nerve, upper leaf surface mainly free of tertiary venation, and elongated, cylindric-paniculate inflorescence, P. loretensis is easily confused with P. cincta Standi, of Colombia and Venezuela. From P. cincta it may be distinguished by the flowers alternately grouped in l’s or 2’s along the ultimate forks of the lateral axes and not bunched closely together at the ends of the axes, glabrous exterior of corolla, hypanthium completely glabrous, calyx tube glabrous and lobes more ovate and narrowed to a rounded-obtuse apex and more prominently developed, lateral axes of the inflorescence with usually longer ultimate forks of 10-20 mm, flowers more numerous on the average per lateral axis, differently shaped longer hypanthium, leaves averaging narrower, stipular teeth averaging shorter (1.5-7 mm), and lateral nerves usually elevated below and impressed above instead of the reverse situation of P. cincta.

Distribution:Peru South America| Brazil South America|