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Olbia Medik.
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Flora of North America Editorial Committee. 2015. Magnoliophyta: Cucurbitaceae to Droseraceae. 6: i–xxiv, 1–468. In Fl. N. Amer.. Oxford University Press, New York.
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Stegia DC.
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Flora of North America Editorial Committee. 2015. Magnoliophyta: Cucurbitaceae to Droseraceae. 6: i–xxiv, 1–468. In Fl. N. Amer.. Oxford University Press, New York.
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