Past Field Trip: Sanborn County Park – Lake Ranch Reservoir, September 2026

Azolla sp., Cyperus erythrorhizos, Rorippa palustris, Lindernia dubia Photos: Dan Antonaccio
Clockwise from top left: Azolla sp., Cyperus erythrorhizos, Rorippa palustris, Lindernia dubia    Photos: Dan Antonaccio

Leader and affiliation: Dan Antonaccio, Field Trip Coordinator CNPS Santa Cruz Chapter

Trip description: 

Dan Antonaccio provided a fieldtrip to botanize Lake Ranch Reservoir in Sanborn County Park (Santa Clara). Walk along John Nicholas trail through a mixed Douglas fir – California bay forest to the reservoir, created in 1874 and still providing water to San Jose today. Many locally rare and unusual aquatic and semi-aquatic plants thrive along the reservoir’s shoreline late into the summer, including redroot flatsedge (Cyperus erythrorhizos), yellowseed false pimpernel (Lindernia dubia), bog yellowcress (Rorippa palustris), mosquito fern (Azolla sp.), western marsh cudweed (Gnaphalium palustre), and several species of Alismataceae.

Distance: 4 miles,  elevation gain: ~200ft

Practice clean trail etiquette.  Pocket Guide – Every Step Counts and Cleanliness Tips for Hikers

 

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