According to Marin 101, the town of Larkspur could have been called Lupine.
The city’s developer, Charles W. Wright was looking for a name for the town he was building. His wife Georgiana saw a hillside covered in blue flowers and thought they were Larkspur, a flower she remembered from England. The flowers were actually native Lupine.
The other option was Graystone, a local rock. Thankfully Larkspur won out!
Image courtesy of Buttersweet