Monographs Details: Psychotria deinocalyx Sandwith
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. British Guiana, Suriname, and southeastern Venezuelan Guayana. VENEZUELA. Bolívar: region de los rios Icabaru, Hacha, y cordillera sin nombre a 280° de las cabeceras del Río Hacha, alt 450-850 m, 2 Jan 1956, Bernardi 2729. BRITISH GUIANA. Basin of Essequibo River, near mouth of Onoro Creek, lat about 1° 35' N, 15-24 Dec 1937, A. C. Smith 2719; rain forest above Camp 1, 6 mi E of Onoro mouth, 1 Oct 1952, Guppy 312 (Forest Dept. no. 7288). SURINAME. Base Camp, Tafelberg Creek, Saramacca River, 12 Jul 1944, Maguire 24099.

Discussion:

Type. Kibihiu Creek, Wiruni River, Berbice River, British Guiana, heavy bush fringing muri bush, 9 Feb 1938, D. B. Fanshawe 39 (Forest Dept. no. 2638).

This species is distinctive in having completely sessile terminal heads of flowers arising between the bases of the petioles, and large, foliaceous, expanded and flaring calyx limb. It is related to P. nudiceps Standl. of Peru, but that species has a shorter calyx not flaring at the summit and shorter corollas. From P. cephalantha (M.-Arg.) Standl. it may be distinguished by the larger heads of flowers, larger calyx and hypanthium, larger corollas, and longer petioles. From Mapouria japurensis M.-Arg. it differs in the non-lanate calyx which is not 5-fid, the larger corolla, and the rounded to subtruncate instead of abruptly aristate stipules.

Distribution:Guyana South America| Suriname South America| Venezuela South America|