Picramnia, commonly known as bitterbushes, is a genus of approximately 44 species of flowering plants in the family Picramniaceae, order Picramniales. The family is the sole member of its order and belongs to the malvids (eurosids II) within the broader rosid clade. Members of Picramniaceae — including Picramnia — were historically placed in the family Simaroubaceae, or occasionally misidentified as members of Sapindaceae (order Sapindales); the APG III classification established Picramniaceae as a distinct family and order.
The genus was described by the Swedish botanist Olof Swartz in 1788 in his Nova genera & species plantarum (Prodromus), based on specimens collected during his travels in the West Indies between 1783 and 1787. The name Picramnia is a conserved name (nomen conservandum), validated against the earlier synonyms Pseudo-brasilium Adans. and Tariri Aubl., both of which have been formally rejected. The type species is Picramnia antidesma Sw.
Picramnia is a Neotropical genus ranging from Mexico and Florida south to northeastern Argentina, making it the most species-rich genus in its family. Its three sister genera in Picramniaceae — Alvaradoa, Aenigmanu, and Nothotalisia — are similarly restricted to the Americas. A biochemical hallmark of the family is the presence of tariric acid as the dominant fatty acid.
Etymology
The genus name Picramnia was coined by Olof Swartz in 1788 and is a conserved name (nomen conservandum) established against the earlier, rejected names Pseudo-brasilium Adans. and Tariri Aubl. The type species is Picramnia antidesma Sw., described from West Indian material collected during Swartz's 1783–1787 expedition.
Distribution
Picramnia ranges from Mexico and Florida (United States) south through Central America and the Caribbean to northeastern Argentina, with greatest diversity in the Neotropics. It is the most geographically widespread genus in the family Picramniaceae.
Taxonomy Notes
Picramnia was long treated within Simaroubaceae, and some members were also misidentified as Sapindaceae. The APG III classification elevated the group to its own family, Picramniaceae, and its own monofamilial order, Picramniales, placed within the malvids (eurosids II). The genus name is conserved (nom. cons.) over Pseudo-brasilium Adans. and Tariri Aubl. A biochemical synapomorphy of the family is tariric acid as the predominant fatty acid.
