The sole member of its genus, P. nummularia has relatively large and very dramatic red flowers. Although it requires cool and moist conditions it has high potential as a horticultural subject. The feature plant above was exhibited in the 2021 virtual show of the Gesneriad Society.
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- A single flower, illustrating the beauty of form and color
- Another photo of a single flower
- A portion of a plant with multiple flowers.
- A whole plant exhibited at the 2017 convention of the Gesneriad Society
This species was originally obtained by the Smithsonian Institution, and then distributed with the collection number USBRG 1994-522.