Template:R:cy:CECP2
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Cymdeithas Edward Llwyd (2003) Planhigion Blodeuol, Conwydd a Rhedyn [Flowering Plants, Conifers and Ferns] (Cyfres Enwau Creaduriaid a Planhigion; 2)[1] (in Welsh), Llanrwst: Gwasg Carreg Gwalch, →ISBN[2]