Lepidium serra is endemic to the island of Kauai in the Hawaiian Islands. It is restricted to the western and northwestern portions of the island. Plants from the Haupu Range on the southeastern part of the island are now recognized as a separate species, L. orbiculare (Wagner et al. 1999). There are many occurrences of Lepidium serra. The species is a pretty consistent, common element of the moist cliff communities within its range and there are many thousands of plants (K. Wood pers. comm., 2000). Threats to the species include feral pigs and goats, deer, and invasive alien plants.
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