Could a change in the ecological niche requirements account for the anomalous decline of 𝘊𝘳𝘦𝘱𝘪𝘴 𝘱𝘶𝘴𝘪𝘭𝘭𝘢 (Sommier) Merxm.?

Abstract

Crepis pusilla (Asteraceae, Cichorieae) is “Critically Endangered” in the Maltese Islands and elsewhere in the Mediterranean. It is a small plant that occurs naturally on shallow and compacted calcareous Terra Rossa and clay soils, usually appressed to the substratum, rarely rising more than a few centimetres above the ground. Its habit is therefore very similar to plants of trodden paths such as Plantago species (Plantago lagopus, P. serraria, and P. coronopus) with which it usually coexists. In Malta, this species is restricted to less than 50 individuals in a single 60 m country path. [excerpt]