Annual, biennial or perennial herbs, sometimes shrubs, rarely trees, tissues sometimes containing milky sap, glabrous, pubescent, tomentose, spinous or variously sessile- or stipitate-glandular. Leaves alternate or sometimes opposite, exstipulate (but sometimes with stipuliform appendages), entire, toothed, lobed or variously dissected. Individual flowers usually numerous, aggregated and ± sessile (briefly immersed to very shortly stipitate) on a common receptacle and surrunded by an involucre of 1-many series of phyllaries (involucral bracts),the whole comprising a capitulum; phyllaries free, rarely connate; capitula solitary to very many, rarely agreegrated into secondary capitulum-like glomerules.Receptable sometimes bearing paleae (scales), hairs or bristles.Flowers (florets)epigynous, bisexual, female, m ale(at least functionally so) or neuter (sterile). Calyx absent, often replaced on apex of ovary by a pappus of 1 or more series of bristles and / orscales. Corolla gamopetalous, tabular throughout or dilated or 1(-2)-lipped above,variously truncate or 1-5-toothed at apex (appices); rarely corolla absent. Stamens (1-)5, epipetalous, filaments free anthers laterally connate into a cylinder around style (free in one species). Ovary inferior, 1-celled with one basal ovule; style usually divided above into two branches, sometimes entire on male flowers, emerging through anther cylinder, first collecting and exposing pollen,later exposing stigmatic surfaces if bisexual. Fruit an achene (cypsela) usually bearing a persistent or deciduous pappus; pappus sessile or borne on a beak(rostrum).
Annual herb; stems erect. Leaves alternate, simple, ± sessile. Capitula solitary or loosely racemose at branch ends, heterogamous, radiate. Involucre hemispherical;phyllaries 2-seriate,free.Receptacle flat,naked.Corollas yellow or orange.Ray flowers several-seriate,female;ligule 3-toothed.Disc flowers male;corolla tubular-campanulate,5-toothed;style branches thickened,scarcely divided.Achenes heteromorphic,rather woody,hispid,tuberculate on the back;outer ones incurved,with stout,indistinct beak;intermediates semicircular or almost coiled,with broad thick lateral wing;innermost tigthly coiled,with reduced wing;pappus absent.
Plant 30-45cm;stems glandular-pubescent.Leaves oblong or oblanceolate 3-8 x 0.7-3.5cm, obtuse, apitulate,attenuate towards base,semi-amplexicaul,remotely denticulate,glandular-pubescent on both surfaces.Involucre 12-15mm diameter;phyllaries lanceolate or elliptic,10-11 x 1.5-2.2mm,acuminate,glandular-pubescent.Ray flowers numerous;corolla tube 1.5mm,pubescent;ligule oblanceolate,18-20 x 3-5mm.Disc corollas 3.5-4mm.Outer achenes c 12mm across arch x 2mm in section,intermediate 8x 6mm across wing,innermost 5 x 2.5mm.