Helianthus inexpectatus is described as a new species from the Newhall Ranch of northern Los Angeles County, California. It is a tetraploid (2n = 68) perennial that is morphologically similar to--—and intermediate in some characters between--—the diploid H. nuttallii and the hexaploid H. californicus.
Keil, David J. and Elvin, Mark A.
"Helianthus inexpectatus (Asteraceae), a Tetraploid Perennial New Species from Southern California,"
Aliso: A Journal of Systematic and Floristic Botany:
1, Article 5.
Available at: https://scholarship.claremont.edu/aliso/vol28/iss1/5