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Polypodium calirhiza is a species that was recognised in 1991 occurring in California and Mexico. It has evolved from an ancient hybrid between
P. californicum and P. glycyrrhiza. The Theodore Payne Foundation website states: "In 1897, Sarah Lyman and her son Jack were walking on a hill in Napa County and came across this interesting fern. She transplanted a clump to her yard. Over the years, it grew and she shared it with friends. In time, the Napa Chapter of the California Native Plant Society became aware of the plant and worked to ensure that it was protected. For some time, it was considered a unique species, but analysis proved that it was a special form of the species Polypodium californicum. At the urging of Jack Lyman, this special form was named for his mother Sarah. Reports indicate that this beautiful fern is still found in the original location where Sarah Lyman found it more than a century ago. And of course, it thrives in our gardens as well." |
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| 25th February 2018 | ||