Monographs Details: Pagamea thyrsiflora Benth.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Rubiaceae
Description:Distribution and Ecology - Distribution. Shrub or small tree to 5 m, ascending to 1600 m on sandstone plateaus and table mountains, British Guiana and southern Venezuela south to Amazonas and Para, Brazil, and west to Vaupes, Colombia. BRITISH GUIANA. Kaieteur Plateau, 3Iaguire ds Fanshawe 23155; Partang River, Merume Mountains, Upper Mazaruni River Basin, Maguire d S. S. ds C. L. Tillett 43874; Kamarang River-Wenamu Trail, Samwarakna Creek, Maguire d Fanshawe 32567. BRAZIL. Serra Tunuhy, Foz do Caiary, Igana, Amazonas, Froes 21371; arenosis Campo Grande, Porto de Mox (ad flumen Xingu inferiore), Para, Ducke 18835. COLOMBIA. Rio Kuduyari (tributary of Rio Vaupes), quartzite savanna, Yapoboda, Vaupes, Schultes ds Cabrera 20015; savanna at Cacagual, Rio Atabapo, Maguire, Wureiack & Keith 41450. VENEZUELA. Amazonas: prope San Carlos, Spruce 2957 (holotype) ; canal de Cassiquiare, Froes 21510; Cerro Moriche, 3Iaguirc, Cowan cD Wureiack. 30861, 30953; west base of Cerro Paru Cowan d Wurdack 31482; Rio Cuao, Rio Sipapo, Maguire & Politi 27855; north escarpment above Culebra, Cerro Duida, Maguire, Cowan & Wurdack 29588 29590 29627; top of Cerro Cariche, Wurdack d Adderley 43660. Bolivar: Sierra Auraima, Steyermark 90836; Sierra de Lema, headwaters of Rio Chicanan Steyermeirk 89630; mesa between Ptari-tepui and Sororopan-tepui, Steyermark 60264; Cerro de las Guacamayas, Rio Avequi, Bernardi 1667; Cerro Arepuchi, Rio Caroni, Cardona 1212.

Discussion:The flowers of this species are usually tetramerous, but may also be pentamerous There is variation in the pubescence on the outer surface of the calyx, and in the shape and width of the leaf-blades. In general, the calyx and corolla are of smaller dimensions than in P. guianensis Aubl., and the flowers are arranged in open branched inflorescences.
Distribution:Guyana South America| Colombia South America| Venezuela South America|