CR

Macrozamia humilis

Stable

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Macrozamia humilis faces severe population decline due to its extremely restricted range in the Blue Mountains of New South Wales, where urban development and infrastructure expansion continue to fragment its remaining habitat. The species is particularly vulnerable to frequent bushfires, which can eliminate entire subpopulations given their slow regeneration rates. Mining activities and quarrying operations pose additional threats to the limited sandstone heath communities where this cycad persists.

Threat summary

Habitat

This cycad is endemic to sandstone heath and woodland communities in the Blue Mountains region of New South Wales, typically growing on shallow soils over sandstone substrates at elevations between 200-800 meters. It occurs in open eucalyptus woodlands and heath shrublands with well-drained, nutrient-poor soils.

Forest· major

Conservation measures underway

Species recoveryLegislation

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Frequently asked questions

Why is Macrozamia humilis classified as Critically Endangered?
Macrozamia humilis 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. Macrozamia humilis faces severe population decline due to its extremely restricted range in the Blue Mountains of New South Wales, where urban development and infrastructure expansion continue to fragment its remaining habitat. The species is particularly vulnerable to frequent bushfires, which can eliminate entire subpopulations given their slow regeneration rates. Mining activities and quarrying operations pose additional threats to the limited sandstone heath communities where this cycad persists.
Where does Macrozamia humilis live?
Macrozamia humilis occurs in Australia. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Macrozamia humilis?
The main threats to Macrozamia humilis are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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