Type. Shrub 1.5 m, young fruit mealy, pinkish, rare in scrub savanna, Samwarakna-tipu (Holi-tipu), Kamarang River—Wenamu Trail, Pakaraima Mountains, British Giiana, alt. 1100 m, 10 Nov 1951, Bassett Maguire & D. B. Fanshawe 32545 (holotype US 2343465).
In the typical subspecies, the largest leaves are 3-3.3 cm wide and only very sparsely strigulose above when young; the triangular usually acute inner calyx lobes are only 1-1.2 m m long. Within the collections of subsp. pycnaster studied by me, about 20 per cent of the flowers were 5-merous. In subsp. robusta, only 7 of 28 observable flowers were 4-merous, the remainder 5-merous. The ovary of C. pycnaster is 3-celled, with the apex very minutely glandular-setulose as well as very sparsely to moderately stellulate-puberulous (and not glabrous as cited in the original description) ; the torus is sparsely glandular-setulose.