Hyperbaena winzerlingii is a species of flowering plant in the family Menispermaceae. It is a shrub or tree with leathery leaves, greenish-yellow flowers, and round fruits. The species is native to Belize, Honduras, and Mexico.
Hyperbaena winzerlingii was described in 1927, and is listed as of Least Concern by the IUCN.
Taxonomy The species was described by Paul Carpenter Standley in 1927.
Distribution Hyperbaena winzerlingii is native to the wet tropical biome of Belize, Honduras, and south-east Mexico (Campeche, Quintana Roo, and Yucatán). It may be present in Nicaragua. The species' extent of occurrence is around .
The species grows in lowland scrub forests and tropical deciduous forests. It is present at elevations of up to .
Description Hyperbaena winzerlingii is a shrub or tree that grows up to high. The trunk is up to wide. The branches are cylindical, and the older branches are grey.
The leaves are leathery, oblanceolate to angulate-obovate, long, and wide. The leaves have a prominent midvein. The leaf stem is long.
The male inflorescences are solitary or in clusters. They grow on stems. The flower stems are long. The flowers are greenish-yellow, and have six sepals in two groups. The outer sepals are obovate, around long, and around wide. The inner sepals are broadly obovate, around long, and around wide. There are six orbicular petals, which are around long and wide. The male flowers have three to five stamens.
The female inflorescences are usually solitary, and grow on stems. The flower stems are long.
The fruits are round, long, and wide. The fruits are smooth, or have sparse soft hairs.
Conservation In 2021, the IUCN assessed Hyperbaena winzerlingii as of Least Concern. The population is large and stable. The species is present in the Sian Kaʼan Biosphere Reserve, the Calakmul Biosphere Reserve, and the Ría Lagartos Biosphere Reserve.
Nomenclature "Knock me down" is a common English name for Hyperbaena winzerlingii. In Spanish, it is commonly known as .
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