Perennials, 20-60[-200] cm (plants ± viscid). Stems erect, simple or branched from bases or ± throughout. Leaves cauline; mostly opposite (distal sometimes alternate); petiolate; blades usually 3-nerved from bases, deltate to ovate, margins dentate to serrate, faces usually hirsute and/or stipitate-glandular. Heads discoid, in paniculiform to corymbiform arrays. Involucres ± cylindric [campanulate or hemispheric], 4-5+ mm diam. Phyllaries persistent, 24-30+ in 3-5+ series, 3-5-nerved, ovate to lance-linear, unequal (herbaceous to chartaceous). Receptacles flat, epaleate. Florets 10-30[-75]; corollas white to ochroleucous, throats ± cylindric (± contracted distally, lengths 4-6 times diams.), lobes 5, oblong-ovate; styles: bases enlarged, hirsute, branches narrowly clavate (distally dilated). Cypselae prismatic, 4-5-ribbed, sparsely scabrellous (at least distally), not gland-dotted; pappi persistent, of 20-40 smooth to barbellate bristles in 1 series. x = 10.
