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Arjona megapotamica is a rare species of flowering plant in the family Schoepfiaceae, native to a small area of southeastern Brazil, where it grows in cool mountain grasslands. Like other Arjona species, it is thought to be a root hemiparasite. It is a small perennial plant growing as a bunch of short twigs from a woody central knob. As of December 2021, Arjona schumanniana was regarded by some sources as a synonym, by others as an independent species.
Arjona megapotamica is endemic to southeastern Brazil. The species formerly occurred in the state of Rio Grande do Sul on granite hills which surround the coastal city of Porto Alegre. These hills have now been extensively developed, and the species was officially declared locally extinct in Rio Grande do Sul in 2014 (Decreto Estadual RS 52.109). It also occurs in the eastern part of the Santa Catarina Plateau in Santa Catarina state according to Mattos, where it presumably may still be found.
Text excerpted from the Wikipedia article Arjona megapotamica by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
