Tag Archives: Santa Clara County

Cirsium praeteriens J. F. Macbr.

Palo Alto Thistle (Cirsium praeteriens)

The Palo Alto Thistle was described in 1918, it is known only from two collections from 1897 and 1901 respectively.

The species resembles the probably closely related Franciscan Thistle (Cirsium andrewsii (A. Gray) Petr.) but differs from that species in having long involucral spines.

The Palo Alto Thistle was not found since the beginning of the 20th century and is considered extinct.


edited: 14.01.2019

Paraleptophlebia clara (McDunnough)

Santa Clara Prong-gilled Mayfly (Paraleptophlebia clara)  

This species was described in 1933.  

The species was known from two locations only, one near the city of Los Gatos in the Santa Clara County, the other one in the Waddell Creek in the Santa Cruz County, both in California, USA.  

The Santa Clara Prong-gilled Mayfly was not found during recent searches and is most likely extinct now.  


edited: 31.10.2017