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Isotrema
See list of 2 species in this genusReference: Barringer (1997).
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1a. Stems and abaxial leaf surface glabrous to puberulent; peduncle with a bract near the middle; annulus smooth
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1b. Stems and abaxial leaf surface tomentose; peduncle without a bract; annulus rugulose
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Each photo represents one species in this genus.