Heterotheca sessiliflora is a species of flowering plant in the Asteraceae (Sunflower) family known by the common name False Goldenaster. It is native to California and Baja California, where it grows primarily along the coast, in the foothills and mountains, in many types of habitat. This is a perennial herb which is quite variable in appearance. There are four recognized subspecies which vary in morphology and geographic range. Depending on subspecies and location, it may be a small clumping or mat-forming plant or grow tall stems to heights exceeding a meter. It may appear as an annual or perennial herb. It is coated in small bristles or long woolly hairs and it is hairy, particularly around the flower cluster. The flower head contains long yellowish disc florets and the edge is fringed with yellow ray florets. Its most outstanding feature is nearly year-round flowering.