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Hesperolinon serpentinum is a rare species of flowering plant in the flax family known by the common name Napa dwarf flax, or Napa western flax. It is endemic to northern California, where it is known from fewer than twenty occurrences in four counties surrounding the San Francisco Bay Area. It is a member of chaparral plant communities, generally on serpentine soils. It produces a thin, erect stem up to 30 centimeters tall, with sparse flat, narrow leaves. The inflorescence holds several light yellow flowers with petals only 2 or 3 millimeters long. The plant is threatened mainly by development of its habitat.
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