Endemic to Kauai, Oahu, Molokai, West Maui, and Lanai. 10 occurrences are currently known, with additional historical ones documented. The actual rarity of the species is difficult to assess since this plant is an inconspicuous annual. Most likely there are many populations yet to be documented. Major threats to the survival of this species are habitat degradation caused by ungulates, competition with alien plants, fires, coastal development, and trampling by humans and ungulates.
feral goats and cattle competition from an alien plant species trampling by humans on or near trails, and fire
individuals in 1 current population 2 known populations on Kauai, 2 West Maui populations, 2 Oahu populations, 1 Molokai population totaling < 1,000 individuals
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