Tag Archives: Rosaceae

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.

*********************  

References:  

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

*********************

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

(public domain)

*********************

edited: 20.09.2020

Rubus huttonii Bailey

Hutton’s Dewberry (Rubus huttonii)

Hutton’s Dewberry is, or rather was, a somewhat prostrate, creeping shrub with 1 to 2 cm large, white flowers that was known from only three nearby localities in West Virginia, USA.

The species was not recorded in recent searches and might be extinct, however, according to some authors it may also be synonymous with another species, the Swamp Dewberry (Rubus hispidus L.) (see photo).

*********************

Swamp Dewberry (Rubus hispidus)

Photo: Jill Lee

(under creative commons license (2.0))
http://creativecommons.org/licenses/by-sa/2.0

*********************

edited: 16.04.2019

Potentilla uliginosa B. C. Johnst. & Ertter

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]

*********************  

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

*********************

Hickman’s Cinquefoil (Potentilla hickmanii Eastw.)

Photo: John Game

(under creative commons license (2.0))
http://creativecommons.org/licenses/by/2.0

*********************

edited: 20.09.2020

Rubus vitifolius var. eastwoodianus (Rydb.) Munz

Eastwood’s Dewberry (Rubus vitifolius var. eastwoodianus)

Eastwood’s Dewberry is known only from the type collected on Mt. Tamalpais in Marin County, California, USA.

Its exact taxonomic status is somewhat in doubt since it is treated as a distinct species by some botanists while it is included as a synonym in an expanded concept of the Pacific Trailing Blackberry (Rubus ursinus Cham. & Schldl.) (see photo) by others. 

Whatever ist taxonomical position may be, Eastwood’s Dewberry appears to be extinct.

*********************

Pacific Trailing Blackberry (Rubus ursinus Cham. & Schldl.)

Photo: Leslie Seaton

(under creative commons license (2.90))
http://creativecommons.org/licenses/by/2.0

*********************

edited: 25.11.2018