Pentanema salicinum (common name Irish fleabane (UK)[1] or willowleaf yellowhead) is a plant species in the family Asteraceae.

It has been reported growing in the wild in a few scattered locations in North America but it has not become widely established there.

It is known from a variety of common names including willowleaf yellowhead, Irish fleabane and willow-leaved Inula.

Pentanema salicinum is to be found extensively across mainland western Europe, from Spain through France, Benelux, Germany, Poland, Denmark and southern Scandinavia.

It is not known how this group of plants became established in Ireland, but it is likely to have been in the last 10,000 years since the end of the last ice age.