Singer, R. 1970: A monograph of the subtribe Omphalinae. Flora Neotropica Monographs. 3.
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| Singer, R. 1970: A monograph of the subtribe Omphalinae. Flora Neotropica Monographs. 3. |
| Singer, R. 1970: A monograph of the subtribe Omphalinae. Flora Neotropica Monographs. 3. |