Helianthus inexpectatus (Asteraceae), a Tetraploid Perennial New Species from Southern California

Abstract

Helianthus inexpectatus is described as a new species from the Newhall Ranch of northern Los Angeles County, California. It is a tetraploid (2n 5 68) perennial that is morphologically similar to—and intermediate in some characters between—the diploid H. nuttallii and the hexaploid H. californicus.