Oxandra is a genus of tropical flowering trees and shrubs in the custard-apple family Annonaceae, placed in the tribe Malmeeae within the subfamily Malmeoideae, and belonging to the order Magnoliales. The genus was described by the French botanist Achille Richard (A.Rich.). Its approximately 28 accepted species are distributed across Mexico, the Caribbean, and tropical Central and South America, including Venezuela, Colombia, Brazil, and Mesoamerica.
As members of Annonaceae — one of the largest families of the order Magnoliales — species of Oxandra share the family's characteristic features: typically alternate, simple leaves with pinnate venation, and flowers with multiple free petals often arranged in two or three whorls. The family is well known for its fleshy, often aggregate fruits and for producing a diversity of bioactive alkaloids.
Within Annonaceae, Oxandra belongs to the Neotropical tribe Malmeeae, a group of genera restricted almost entirely to the Americas. Related genera in the same tribe include Cremastosperma, Mosannona, Malmea, Pseudomalmea, and Pseudoxandra.
Etymology
The name Oxandra was given by the French botanist Achille Richard. The authorship citation "A.Rich." refers to Achille Richard, who described the genus.
Distribution
Oxandra is native to Mexico and tropical America, with species occurring across the Caribbean, Central America, and northern and western South America, including Venezuela, Colombia, Guyana, and Brazil.
Taxonomy Notes
Oxandra (A.Rich.) is placed in the tribe Malmeeae of subfamily Malmeoideae within Annonaceae, order Magnoliales. The tribe Malmeeae is a Neotropical clade within Annonaceae and includes related genera such as Bocageopsis, Cremastosperma, Ephedranthus, Klarobelia, Malmea, Mosannona, Onychopetalum, Pseudomalmea, and Pseudoxandra. Plants of the World Online recognized approximately 28 accepted species as of January 2025.
