A perennial herb up to 100 cm tall, with a branched woody rootstock. It can have 1 to 5 puberulent (hairy) stems. Leaves are toothed, tapering at the tip, puberulent on both sides. Flowering heads number 15 to 250, in an elongate, paniculiform array. Ray flowers are yellow, 9 to 16 per head. Disc flowers number 6 to 15 per head, each up to 3 mm long.
Typically blooms from August to October.