Pentanema squarrosum, known as ploughman's-spikenard,[1] is a species of plant in the family Asteraceae found in Europe, North Africa, and the Near East.

[2][3] It is a tall, hairy plant (to 1.2 m) that grows on calcareous, low-nutrient, well-drained soils.

Before flowering, the basal rosette of leaves resembles those of foxgloves.

It flowers after mid-summer in Europe, from July to September.

[4] The leaves are burned and used as an insecticide and parasiticide, especially against fleas.