[1] João Murça Pires and William Antônio Rodrigues the Brazilian botanists who first formally described the species, named it in after Manaus, where the specimen they examined was collected.

Its leaves are in alternate positions on the stems and lack distinct petioles.

Its inflorescences are axillary and arranged as modestly branching, rigid panicles that are 12 centimeters long and covered in very small, fine hairs.

Male flowers are small, solitary and lack a distinct pedicel.

Male flowers have 4 oval sepals, covered in fine hair, that are 1.35 by 1 millimeters.