Hesperevax caulescens

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Hesperevax caulescens occurs mainly in the Sacramento and northern San Joaquin valleys, with southern outliers in the southern San Joaquin and upper Salinas River valleys and the Otay Mesa area of San Diego County. The Otay Mesa populations are thought to have been naturalized (R. M. Beauchamp 1986) and are now considered extirpated. An 1869 specimen from northern Oregon is likely either mislabeled or from an introduction that did not persist.