Condylocarpon amazonicum is a species of plant in the Apocynaceae family. It is native to Bolivia, Brazil, Suriname, and Venezuela. Friedrich Markgraf, the botanist who first formally described the species, using the basionym Anechites amazonicus, named it after the area near the Amazon River in Pará Brazil where the specimen he examined was collected by Adolpho Ducke.
It is a climbing plant. Its reddish-brown, slender, cylindrical, tapering branches have glistening, gold-colored warty bumps, and lenticels. The branches are slightly to densely covered in soft, gold-brown hairs. Its leaves are positioned opposite to one another. Its slightly leathery, broad lance-shaped leaves are 7âÂÂ12 by 2.5âÂÂ5 centimeters. The tips of its leaves are pointed or come to a tapering point. The bases of the leaves are blunt or have a cut-off shape. The top sides of the leaves are hairless to slightly hairy, and the lower sides are slightly hairy to densely covered in soft hairs. The leaves have 12âÂÂ15 pairs of secondary veins emanating from their midribs. The midvein and secondary veins are elevated on the undersides of the leaves. Its black, hairless petioles are 0.5âÂÂ1 centimeters long and have a shallow groove. Its many-flowered Inflorescences occur at the junction between the leaves and stem or in terminal positions. Its inflorescences are slightly to densely covered in reddish-brown soft to velvety hairs. Each flower is on a slender, slightly hairy pedicels that is 0.5âÂÂ2 millimeters long. Its flowers have 5 sepals with egg-shaped to triangular lobes that are slightly to densely covered in soft hairs. The 5 greenish-white to cream-colored petals are fused at their base to form a 2 by 0.5âÂÂ1 millimeter tube that constricts at the top and then expands abruptly into 1âÂÂ1.8 by 0.7 millimeter spreading lobes. The petal lobes have blunt tips. Its egg-shaped stamen are inserted a little more than half-way up the tube of the petals. Its pistils have cone-shaped ovaries that are 0.6 millimeters long. The ovaries have 2 carpels. The carpels have 4 ovules arranged in two rows. Its stigma are shaped like an inverse-cone. Its woody fruit are divided into two long, thin sections that are each 10.5âÂÂ15 centimeters long. The fruit are covered in velvety rust-colored to brown hairs that are 3âÂÂ5 millimeters long. Only one seed develops in each section of the fruit. The seeds are 1.5 by 3 millimeters.
The pollen of Condylocarpon amazonicum is shed as permanent tetrads.
It has been observed growing in secondary and riparian forests at elevations up to 90 meters.