Triumfetta rhomboidea (Diamond Burbark) is a species of shrub in the family mallows. They have a self-supporting growth form. They are native to Mato Grosso Do Sul, SãO Paulo, Bahia, Paraná, Minas Gerais, Acre (Brazil), Alagoas, Cerrado, Caatinga, Distrito Federal, Mato Grosso, Amazônia, Santa Catarina, Rio De Janeiro, Mata Atlântica, ParaíBa, Pernambuco, and GoiáS. They have simple, broad leaves. Flowers are visited by Lipotriches bigibba, Amegilla spilostoma, and Nomia viridilimbata. Individuals can grow to 1.9 m.
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