Cunningham Marsh Cinquefoil (Potentilla uliginosa)
The Cunningham Marsh Cinquefoil, formerly included in another species, Hickman’s Cinquefoil (Potentilla hickmanii Eastw.) (see photo), was described as a distinct species only in 2010.
This species was apparently restricted to Cunningham Marsh in Sonoma County, California, USA but appears to be extinct now. [1]
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References:
[1] Barry C. Johnston; Barbara Ertter: Potentilla uliginosa (Rosaceae: Rosoideae) a new presumed extinct species from Sonoma County, California. Journal of the Botanical Research Institute of Texas 4(1): 13-18. 2010
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Photo: John Game
(under creative commons license (2.0))
http://creativecommons.org/licenses/by/2.0
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edited: 20.09.2020