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Achenes obovoid-oblong or turbinate, rounded or truncate at the apex, ecostate, or 4–6-ribbed, or 8–10-ribbed, polished and smooth or with hooked or ± straight simple or bifid trichomes and globose-glandular trichomes.
Leaves opposite, alternate, or in one species in whorls of 3, sessile or petiolate, lamina upper surface sparsely pilose to scabridulous, lower surface closely whitish-silvery araneose-felted.
Corollas purple or mauve, regular, narrowly infundibuliform, 5-lobed, usually puberulous, the lobes sometimes with acicular bristles and/or T-shaped to Y-shaped hairs.
Involucres obconic to cyathiform; phyllaries ± diverging, increasing in size to the inside, membranous or scarious usually with subhyaline margins.
Capitula usually small, few to numerous, laxly arranged in corymbiform cymes, or shortly-stalked in small clusters, homogamous and discoid.
Pappus 0, or of a few short very caducous barbellate setae, or of persistent overlapping scales.
Annual or perennial herbs with simple to much-branched, erect or decumbent stems.
Vegetative indumentum of short-stalked, long-armed, symmetrical T-shaped hairs.
Anthers lanceolate-appendiculate at the apex, obtuse at the base.
Receptacle plane or alveolate.
Style-arms linear, hairy.