Like citrus and street lamps, Western Wallflower comes in both orange and yellow varieties (yes, shut up about the limes already). The orange subspecies, Erysimum capitatum ssp. capitatum, prevails at the lower elevations of Yosemite and in the foothills, but at around 7,000 feet, the orange flowers bow out and the yellow variety, Erysimum capitatum ssp. perenne, takes over. Trails along the Tioga Road - and in fact various spots along the road itself - are the best places to go if you seek ssp. perenne.
This Photo: Along Tioga Road near the Dana-Gibbs reflecting pond, late July