Hyperbaena oblongifolia is a species of flowering plant in the family Menispermaceae. It is a climbing shrub with membranous leaves, greenish-yellow flowers, and green fruits. The species is native to Argentina, Brazil, and Paraguay, and was described in 1864.
Taxonomy The species was described by August W. Eichler in 1864, and placed in the genus Pachygone. In 1903, Robert Hippolyte Chodat and Emil Hassler moved the species to the genus Hyperbaena.
Distribution Hyperbaena oblongifolia is native to the seasonally dry tropical biome of north-east Argentina, Brazil (north, south and south-east), and Paraguay.
Description Hyperbaena oblongifolia is a climbing shrub with cylindrical branches.
The leaves are ovate to oblong-ovate, membranous, long, and wide. The edges are smooth and undulating, and the leaf stems are long.
The male inflorescences are solitary or clustered spikes or racemes that grow on stems. The flower stems are up to long. The male flowers are greenish-yellow, and have six sepals. The outer sepals are obovate, around long, and around wide. The inner sepals are obovate, around long, and around wide. The male flowers have six petals, which are obovate, around long, and around wide. The male flowers have six stamens.
The female inflorescences are usually solitary spikes or racemes that grow on long stems. The flower stems are up to long. The female flowers are greenish-yellow, and have six sepals. The outer sepals are ovate to obovate-lanceolate, around long, and around long. The inner sepals are broadly ovate to obovate, around long, and around wide. The female flowers have six petals, which are ovate to obovate, around long, and around wide. The female flowers have two to four carpels.
The fruits are green, obovoid, long, and wide.
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