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Olof Ryding, Myxocarpy in the Nepetoideae (Lamiaceae) with Notes on Myxodiaspory in General, Systematics and Geography of Plants, Vol. 71, No. 2, Plant Systematics and Phytogeography for the Understanding of African Biodiversity (2001), pp. 503-514
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Olof Ryding (2001) studied this question.
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