Monographs Details: Psychotria borjensis Kunth
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. Orinoco drainage of southwestern Venezuela, Brazil, French Guiana, and Suriname. VENEZUELA. Amazonas: prope Esmeralda, a fluvium Orinoco, Dec 1853, Spruce 3214; en la selva alta, rebalsera de Tamatama, Alto Orinoco, alt 121 m, 6 May 1942, Williams 15208; southern part of Isla del Raton, 5° 2' N, 67° 46' W, bank of Orinoco River, alt 90 m, 24 Nov 1965, Breteler 4813. BRAZIL. Amazonas: Santarem, Feb 1850, Spruce 660; Manáos, Rio Negro, Jun 1910, Ule 8970 (type collection of P. camporum). Bahia: Bahia, Blanchet 513, 519; circa Bahia, 1831, Blanchet 907- Rondonia: Rio Jamari-Santa Cruz, 28 Jun 1965, Pires 9989. FRENCH GUIANA, piste Sophie. Samson, 4 Sep 1962, Halle 771. SURINAME. Litanie River, Versteeg 311.

Discussion:

Mapouria borjensis (H.B.K.) M.-Arg., Mart. Fl. Bras. 6(5): 404. 1881.

Mapouria umbrosa M.-Arg., Flora 59: 459, 466. 1876; Mart. Fl. Bras. 6(5): 404. 1881.

Psychotria ligustrina Willd. in R. & S., Syst. Veg. 5: 188. 1819.

Psychotria camporum Krause, Notizbl. Bot. Gart. Berlin 6: 208. 1914.

Type. San Borja, Orinoco, Amazonas, Venezuela, Humboldt & Bonpland.

The commissural face of the seed in this species is subconcave with a linear scar down the center, but not a deep groove. By Müller-Argoviensis Mapouria umbrosa is differentiated from M. borjensis by having the anthers half to almost twice longer than broad instead of 2 1/2 times longer than broad as in M. borjensis. Actually, I can find no real differences to separate the two. Anthers of Psychotria borjensis are 0.7 mm long and are 3-4 times longer than broad, those of Mapouria umbrosa taken from Blanchet 907 measure 0.6 mm long and are about 3 times longer than broad. Both taxa show the same type of cuspidate stipules, puberulent midrib and lateral nerves of the lower side of the leaf blade, puberulent peduncles, axes of inflorescence, and calyx and hypanthium. Density of the pubescence on the upper internodes varies, often becoming nearly glabrate in age. Similarly, the type collection examined of Psychotria camporum (Ule 8970) shares the characters which distinguish P. borjensis, such as externally puberulent corolla, puberulent calyx and hypanthium, and cuspidate stipules. Although described by Krause as having glabrous branches and leaf blades, the type collection at Museo Goeldi shows puberulent uppermost stems and densely puberulent lower midrib and lateral nerves of the leaf blades.

Distribution:Venezuela South America| Brazil South America| French Guiana South America| Suriname South America|