Hyperbaena allenii is a species of plant in the family Menispermaceae. It is found in Costa Rica and Panama. It is threatened by habitat loss.
Description Hyperbaena allenii is a slender tree up to . The branches are cylindrical and greyish. The leaves are leathery, oblong-lanceolate, long, and long. The leaf edges are smooth, and the leaf stalk is long.
The male inflorescences are solitary or in clusters, and grow on stalks. The male flowers have stalks up to long. The male flowers are greenish, and have six sepals, arranged into two groups. The outer sepals are around long, and around wide. The inner sepals are around long, and wide. The male flowers have six petals, arranged into two groups. The petals are around long, and wide. The male flowers have six stamens.
The female inflorescences are solitary or in clusters, and grw on long stems.
The fruits are round, long, and wide.
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