Isodendrion pyrifolium

Isodendrion pyrifolium is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Isodendrion pyrifolium faces severe population decline primarily due to habitat destruction from urban development and agricultural expansion across its limited Hawaiian range. Invasive plant species compete directly with this endemic shrub for resources and alter soil chemistry, while feral ungulates like pigs and goats trample seedlings and degrade the understory habitat essential for regeneration. Climate change compounds these pressures by shifting precipitation patterns and increasing drought stress in its already restricted montane forest habitat.

Isodendrion pyrifolium occurs in United States. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.

The main threats to Isodendrion pyrifolium are 11.1, 11.2, 5.3, and 7.1. The full IUCN-classified threat record for this species is detailed on the species page.