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CA 15. Pitkin and Atascadero Creek Marshes. Acreage: About 400. 



Location: Sonoma County; Sebastopol and Camp Meeker quadrangles; about 4 

 miles N of Sebastopol; reached via Rt. 1 16. 



Description: The Pitkin Marsh is a narrow area, slightly more than one mile 

 long in an oak woodland, Douglas fir region. It is in the valley of a small inter- 

 mittent stream (unnamed) which opens into Atascadero Creek Marsh. At the 

 northern end of this marsh Atascadero Creek flows into Green Valley Creek, a 

 southern tributary of the Russian River. Because of the common drainage, these 

 two marshy areas are best considered together. The entire marsh consists of 

 open marshy areas alternating with willow or azalea thickets. The wet marshy 

 places are sedge bogs, which are a kind of quaking bog. The important feature 

 of this marsh is a floristic one, the geographic affinities of many of its plants 

 being boreal. The following plants reach their southernmost distribution in the 

 California Coast Ranges: Sparganium multipedunculatum, Glyceria elata, 

 Deschampsia caespitosa, Calamagrostis Bolanderi, Agrostis oregonensis, Rhyn- 

 cospora spp., Tofieldia occidentalis, Drosera rotundifolia, Sium suave. 



References: Rubtzoff, P. 1953. A phytogeographical analysis of the Pitkin 

 Marsh. Wasmann J. Biol. 1 1(2 ): 1 29-2 1 9. 



Encroachments: Pitkin section is grazed but not overly so. Atascadero Creek 

 has no grazing and no encroachments so far as known. 



Ownership: Private. The Pitkin family owns most of the Pitkin Marsh. 



Data source: Dr. Elizabeth McClintock, California Academy of Sciences, San 

 Francisco, Calif. 94118. 



Other knowledgeable persons: Peter Rubtzoff, California Academy of Sciences, 

 San Francisco, Calif. 94 1 1 8. 





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