I recently found this photo (click to enlarge) among pictures and papers that belonged to Clara Paxton Jones, and I believe it is probably her grandfather Samuel Paxton (1834-1903), whose farm in Montrose, Missouri, is pictured here.
The photo was taken at Latour Studio in Joplin, Missouri, where Samuel lived the last few years of his life. There is no identification on it, but the subject's age and the photo's presence in Clara's pictures leads me to believe it is Samuel.
I don't know why, but whenever I look at him I can't stop thinking about Wooly Willy.
UPDATE, 7/22/07: A Paxton cousin remembers having a copy of this photo and confirms that it is in fact Samuel Paxton. Thanks, cousin!