Tag Archives: Mariposa County

Paraleptophlebia placeri Mayo

Placer’s Prong-gilled Mayfly (Paraleptophlebia placeri)  

This species was described in 1939.  

The species appears to have been quite widespread, it was originally found in at least three sites: Amador Creek, Dry Creek, Grass Valley Creek, and Jackson Creek in the Amador County, but was also found in other areas including Alameda County, El Dorado County, Marin County, Mariposa County, and Shasta County in California, Benton County, Josephine County, Lincoln County, and Union County in Oregon, as well as Grays Harbor County in Washington.  

The youngest specimens date to 1977, younger collections are not known, and it is possible that this species is already extinct.  


edited: 31.10.2017

Erigeron mariposanus Congdon

Foothill Fleabane (Erigeron mariposanus)  

The Foothill Fleabane is known only from material that was collected during the years 1892 to 1900, somewhere at the foothills of the central Sierra Nevada Mountains in Mariposa County of California, USA.  

The species was for some time treated as a synonym of Hartweg’s Fleabane (Erigeron foliosus var. hartwegii (E. Greene) Jepson), from which, however, it differs markedly.  

The Foothill Fleabane is thought to be extinct, the reasons for this, however, appear to unknown. [1]  



[1] Guy L. Nesom: Revision of Erigeron sect. Linearifolii (Asteraceae: Astereae). Phytologia 72 (3): 157-208. 1992  


edited: 09.09.2019