Sore-mouth bush

Description

Psychotria poeppigiana is a plant species in the family Rubiaceae; a common name is sore-mouth bush, though it is not very often used. This species is currently accepted as Palicourea tomentosa based on a journal article published in 2011. It ranges widely in the tropical Americas, from Chiapas, Oaxaca, Tabasco and Veracruz in Mexico to the very north of Argentina. It does not occur on the Pacific side of the American cordillera however, and is thus absent from El Salvador and Chile. It is probably also absent from Uruguay and Paraguay. P. poeppigiana is a large shrub. The inflorescences are carried upright or semi-erect and are surrounded by large bracts, colored a conspicuous red, that attract pollinators. The flowers themselves are inconspicuous, with the small yellow petals and sepals forming a narrow corollar tube. Pollinators are mainly hummingbirds, namely small hermit (Phaethornithinae) species like the black-throated hermit (Phaethornis atrimentalis), straight-billed hermit (P. bourcieri) and reddish hermit (P. ruber). They do not insert their bills deeply into the small flowers, and thus the pollinators of the sore-mouth bush include curved- and straight-billed species alike. Psychotria poeppigiana has several uses in folk medicine; it is widely used as a painkiller besides having some more specialized applications. The Tiriyó of Surinam crush and boil the plant and use the resulting decoction to treat headaches, sprains, rheumatism, muscular pains and bruises. The Wayana, also of Surinam, grind the bark and apply it raw to a particular rash known to them as poispoisi. The bracts are crushed to release the sap, which is then applied into the ear canal to relieve earaches. The decoction from the inflorescence, boiled whole, is credited with antitussive qualities and used as a whooping cough remedy and more generally to treat respiratory tract infections, as are decoctions of the leaves of ssp. barcellana. It also contains dimethyltryptamine, though as suggested by the use native peoples make of it probably not in quantities to render it strongly psychedelic. Psychotria is a genus of flowering plants in the family Rubiaceae. It contains 1,582 species and is therefore one of the largest genera of flowering plants. The genus has a pantropical distribution and members of the genus are small understorey trees in tropical forests.