The population trend for "L. conjugens" is one of declining numbers as well as shrinking range. According to Jepson, the historic range includes areas not in the present range: parts of the North Coast, more eastern reaches of the Sacramento Valley, more southerly parts of the San Francisco Bay Area and parts of the South Coast. Moreover, the U.S. Fish and Wildlife Service alludes to historic populations in Contra Costa County and Santa Clara County. More specifically another source defines the extended historic San Francisco Bay Area range to have extended from Richmond to Palo Alto By the year 1995 the populations of "L. conjugens" had declined to the point where there were only five colonies extant, all of which were within Napa and Solano Counties.