stamens of whorl III 1.5 - 1.9 mm long, filament sparsely puberulous along median line and 
margins adaxially, puberulous or glabrescent abaxially, anthers 0.7 mm long, sparsely 
puberulous adaxially at the base, glabrous abaxially, sporangia two, extrorse-latrorse, glands 0.4 
- 0.6 mm long, at filament base, glabrous ad and abaxially, staminodes 0.8 - 1 mm long, filament 
sparse to densely sericeous ad and abaxially, head 0.6 mm long, triangular, base shallow cordate, 
glabrous adaxially, sparsely sericeous abaxially at the base, hypanthium 0.8 - 1.1 mm deep, 
glabrous to sparsely puberulous outside, sericeous inside (sometimes sparsely so) inside, pistil 
1.9 - 2.5 mm long, glabrous, ovary 0.8 - 1 mm long, ca. 1 mm wide; fruit 16 - 18 mm long, 9 - 
11.5 mm wide, ellipsoid, cupule 7.5 - 12 mm long, 10 - 11 mm wide, narrowing to a base ca. 1.8 
mm wide, or with a thick cilindrical pedicel 5 mm long, 3 mm wide, tepals partially persistent. 
Flowers are present in August and September; ripe fruits are present from November 
through January. Tropical rain forest is the habitat where this species grows, between 250 - 450 
(1200) m of altitude. So far this species is known from the Amazonian lowlands of Ecuador. 
The presence of fistulose twigs, leaves mostly pinninerved, anthers of whorl III with two 
sporangia, and tepals partially persistent in fruit distinguish this species from the 
morphologically close C. chavarriana and C. hammeliana. See also comments under C. 
formicarium. 
Specimens examined. ECUADOR. Napo. Estacion Biol. Jatun Sacha, 8 km al este de 
Misahualli, rio abajo en la margen derecha del Rio Napo, W. Palacios 2886 (G (4 sheets), MO, 
US, NY); Estacion Biol. Jatun Sacha, C. Cerén & M. Ceron 4718 (G, MO); margen derecho del 
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