In Santa Rosa Rural Cemetery, 1853-1905 (Sonoma County Genealogical Society, Inc., Santa Rosa, Ca; 1st Edition, March 1980), a Wilheminia Schwan is listed as being buried in the Rural Cemetery (page 105). She was born in Germany and died November 3, 1903 at 70 years and 16 days, which means she was born on November 19, 1833. Her father is listed as being Frederick Wendt from Germany and her mother as "Paulina - -" also from Germany. Her husband is listed as Leonard Schwan. This was confusing to me when I first read this, particularly since I did not know at the time, the relationship of Wilheminia to my great great grandfather, Frederick. He was born January 12, 1837 and married Paulina Lang on January 17, 1869 and there was no mention of him having a daughter named Wilheminia, nor was there ever a story in my family, that "old Fred Wendt" had a sister who also had a family.
Also, when I obtained a copy of Frederick's death certificate I was confused even more. It was filled out by his son Leonard, and it stated that Frederick's father's name was not known but that he was born in Germany and that Frederick's mother name is listed as being Paulina Lang (!) who was also born in Germany as well.

Buried in the sites close to Wilheminia's is Leonard Schwann (with an extra "n") who was also born in Germany and died on January 9, 1904 at 71. There is also a Frank Schwann buried between Wilheminia and Leonard, whose date and place of birth is not listed, though he died October 29, 1936 at 71 as well. His father is listed as being Leonard Schwan and his mother is Wilheminia Wendt. The information was given by a Wilheminia Forgett, 421 Washington Street., Santa Rosa. I attempted to find this person with no luck.

Later, through using the Surname Directory of the Sonoma County Genealogical Society, 1991-1992, I came into contact with Priscilla Talmage, the great x 3 granddaughter of Wilheminia Wendt Schwan. She told me that Wilheminia's and Frederick's mother, Dorothy, also came out with them from New Jersey. She was born either in Baden or Waganfeld and that she remarried someone named Baker. Her son Henry Baker, was the first fire chief for Santa Rosa. Dorothy's daughter Wilheminia also had a daughter named Wilheminia who in turn had a daughter named Wilheminia -- the name being passed along in the family in a similar fashion as Frederick was in my side of the family. Mrs. Talmage became ill shortly after and I have lost contact with her, however, I followed her leads to find information on Wilheminia's mother (and my great x 3 grandmother).

Obituary for Wilhelmina Schwan from The Press Democrat, Friday Morning Nov 6, 1903, No. 273, p. 6:

The funeral of the late Mrs. Wilhelmina Schwan took place on Thursday afternoon in the presence of a large gathering of relatives and friends. The internment was in Rural Cemetery. There were many beautiful floral pieces sent to adorn the casket and last resting place.