[wildlife.ca.gov] Endangered status, Description, Habitat, Threats: Tiburon jewelflower is a California endangered plant species, which means that killing or possessing this plant is prohibited by the California Endangered Species Act (CESA). This species is also listed as endangered under the federal Endangered Species Act(opens in new tab). Tiburon jewelflower is an annual herb in the mustard family (Brassicaceae) that grows from one to two feet tall, and produces dark purple flowers which typically bloom in May and June. This species grows on shallow, rocky serpentine soils on southwest facing slopes of the Tiburon Peninsula in Marin County. The primary threats to Tiburon jewelflower are urban development and foot traffic. Although the populations are at least partially protected, a portion of the Old St. Hilary?s Church Preserve site is proposed for development. Even in areas where the habitat is protected, surrounding development results in increased foot traffic, dog walking and off-leash dogs, erosion, increased runoff, and encroachment of non-native invasive plants. The restricted range and small population sizes of Tiburon jewelflower place it at risk of extinction from catastrophic or stochastic events and loss of genetic variability. Climate change may also threaten the survival of the species. (link added by Mary Ann Machi)