The event will be from 8:30 a.m. to 12:30 p.m. Friday. Volunteers will be on the steep section of Prairie Ridge identifying plant populations, flagging them and noting the locations on global positioning system units. They will help determine if plant populations have increased or decreased since the last count three years ago.
The two rare plants are the Big-scale Balsamroot and the Tiburon Indian Paintbrush. Volunteers should be prepared for a 3-mile hike.
To register, contact Sue Wickham at email@example.com, 432-0150 ext. 207, or 590-0307. Lynch Canyon is located in the hills between Fairfield and Vallejo along Interstate 80 and can be reached by taking McGary Road to Lynch Road.