CR

Bent Treacle Mustard

Erysimum deflexum

Declining

Overview

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

Erysimum deflexum faces severe threats from habitat destruction due to urban development and agricultural expansion across its limited Mediterranean range. The species' extremely restricted distribution makes it particularly vulnerable to localized disturbances, while climate change poses additional pressure through altered precipitation patterns and increased drought frequency. Invasive plant species compete directly with this rare wallflower for the specific soil conditions and microhabitats it requires for survival.

Threat summary

Habitat

Erysimum deflexum inhabits rocky limestone slopes, cliff faces, and disturbed ground in Mediterranean scrubland environments. The species typically grows in well-drained, calcareous soils at moderate elevations, often in areas with sparse vegetation cover and high sun exposure.

Rocky areas· major

Conservation measures underway

Site/area protectionSpecies recovery

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Scarce BlackneckCR

Scarce Blackneck

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Frequently asked questions

Why is Bent Treacle Mustard classified as Critically Endangered?
Bent Treacle Mustard 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. Erysimum deflexum faces severe threats from habitat destruction due to urban development and agricultural expansion across its limited Mediterranean range. The species' extremely restricted distribution makes it particularly vulnerable to localized disturbances, while climate change poses additional pressure through altered precipitation patterns and increased drought frequency. Invasive plant species compete directly with this rare wallflower for the specific soil conditions and microhabitats it requires for survival.
Where does Bent Treacle Mustard live?
Bent Treacle Mustard occurs in Türkiye. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Bent Treacle Mustard?
The main threats to Bent Treacle Mustard are 5.3, 6.1, ai-1, and ai-2. The full IUCN-classified threat record for this species is detailed on the species page.

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