Plumbago socotrana

Plumbago socotrana (synonym Dyerophytum socotranum) is a small shrub growing up to 2m tall, rather glaucous and covered in white mealy powder. It has yellow flowers.

Habitat
Plumbago socotrana is endemic to Socotra (Yemen). It lives in dry habitats on limestone cliffs, boulders and wadis from 30 to 650 meters elevation.