Potentilla multijuga Lehm.

Ballona Cinquefoil (Potentilla multijuga)  

The Ballona Cinquefoil, sometimes also named the Lost Cinquefoil, was described in 1849, it was collected somewhere in or near the city Los Angeles, Califonia, USA but was obviously never found again since.

Some botanists considered this form a misidentified Wedgeleaf Horkelia (Horkelia cuneata Lindl.), whose leaves are almost identical, however, it appears to be indeed a distinct taxon and is now apparently extinct.

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References:  

[1] Per Axel Rydberg: A monograph of the North American Potentilleae. Lancaster, Pa., Press of the New Era Print. Co. 1898.

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Depiction from: ‘Per Axel Rydberg: A monograph of the North American Potentilleae. Lancaster, Pa., Press of the New Era Print. Co. 1898.’

(public domain)

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edited: 20.09.2020