Flora 57: 70 (1874). Type locality: Brazil, Pará, Santarém, mouth of Rio Tapajos, 1849-1855, R. Spruce in Spruce, Lich. Amaz. And. 26 (H-NYL 38843 - holotype; BM, G, PC, TUR-V 19989 - isotypes).
Type locality: Brazil, Pará, Santarém, mouth of Rio Tapajos, 1849-1855, R. Spruce in Spruce, Lich. Amaz. And. 26 (H-NYL 38843 - holotype; BM, G, PC, TUR-V 19989 - isotypes).