Nancy Hensold, Morphology and Systematics of Paepalanthus Subgenus Xeractis (Eriocaulaceae), Systematic Botany Monographs, Vol. 23, Morphology and Systematics of Paepalanthus Subgenus Xeractis (Eriocaulaceae) (Jul. 11, 1988), pp. 1-150
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Nancy Hensold (1988) studied this question.
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