Claim: Helianthus exilis is a species of flowering plant reaching over a meter (40 inches) of the genus Helianthus, from the Asteraceae family that is endemic to northern California .
Evidence: Helianthus Genus: Asteraceae Family: Helianthus exilis is an erect annual reaching heights over a meter (40 inches)). It is endemic to northern California (from Siskiyou County south to Napa County and Nevada County), where it grows mainly in mountainous areas, often in serpentine soils. Angiosperms The flowering plants, also known as Angiospermae (/ˌændʒioʊˈspɜːrmiː/), or Magnoliophyta (/mæɡˌnoʊliˈɒfɪtə, -oʊfaɪtə/), are the most diverse group of land plants, with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species.