[Wikipedia] Rarity, Range, Description: Streptanthus vernalis is a rare species of flowering plant in the mustard family known by the common name early jewelflower.[1] It was first observed in the 1970s but not actually described to science until 2005.[2] It is endemic to Lake County, California, where it is known from a single occurrence at Three Peaks near the Napa County line. It is apparently limited to serpentine outcrops in forested and chaparral habitat. Genetic analysis indicates that the species is distinct from other Streptanthus and is most closely related to Streptanthus morrisonii, which it resembles.[2] The fruit is a flattened straight silique 3 to 5 centimeters long containing orange seeds. (link added by Mary Ann Machi)