Sonchus brachylobus
The tree dandelions are as famous as the echiums when it comes to Canary Island flora. The best known is S. canariensis which can grow to 2m high and has large, lobed leaves more than 30cm long that form showy rosettes and produce great, branching heads of bright, dandelion flowers. But I noticed this smaller species which has twisting branches to form a small shrublet about 60cm high with clusters of four or five flowers on each stem in the centre of each leaf rosette. It is too much like a normal sow thistle to float my boat but it is representative of the islands.
The Biking Gardener 
Another interesting fact, thanks. Tree dandelion?
I picture having to climb trees with my fork to get rid of them? Do they also have that rather acrid smell like our dandelions?