Simira walteri Silva Neto & Callado (Rubiaceae, Simireae) is described and illustrated. It grows in the Atlantic Forest region in the state of Rio de Janeiro, Brazil, to an altitude of 600 m. The new species resembles S. viridiflora (Allemão & Saldanha) Steyermark, which also occurs in the Atlantic Forest in southeastern Brazil. Simira walteri mainly differs in having elliptic leaves with apices acute to slightly acuminate, base acute, tufted pocket-domatia, and a single row of colleters on the internal stipule base.
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Vol. 18 • No. 3