Xerochrysum Tzvelev, Novosti Sist. Vyssh. Rast.

Collins, Timothy L., Schmidt-Lebuhn, Alexander N., Andrew, Rose L., Telford, Ian R. H. & Bruhl, Jeremy J., 2022, There’s gold in them thar hills! Morphology and molecules delimit species in Xerochrysum (Asteraceae; Gnaphalieae) and reveal many new taxa, Australian Systematic Botany 35 (2), pp. 120-185 : 143

Xerochrysum Tzvelev, Novosti Sist. Vyssh. Rast. 27: 151 (1990)

Type: Xerochrysum bracteatum (Vent.) Tzvelev.

Bracteantha Anderb. & Haegi, Opera Bot. 104: 102 (1991), nom. illeg. Type: Bracteantha bracteata (Vent.) Anderb. & Haegi.

Annual or perennial herbs, usually taprooted, sometimes rhizomatous. Indumentum cobwebby, felted, hirsute, hispid, pilose, tomentose, villous, or woolly, with septate trichomes, often flagelliform, and with sessile or stipitate glands. Leaves alternate; lamina flat or with margin recurved. Capitula terminating branches or branchlets, homogamous or heterogamous, disciform. Phyllaries multiseriate, medial phyllaries longest; lamina rigidly chartaceous, often spreading at junction with claw when mature; claw coriaceous, broadly oblong, flat; stereome broad, that of inner phyllaries fenestrate, veins numerous and extending into lamina, veins each of equal thickness in the X. bracteatum group, or central vein thickest in the X. milliganii group. Receptacle ± flat or concave, epaleate. Outermost florets usually sterile or sometimes female; corolla very narrowly tubular, shorter than bisexual florets, 3-, 4- or 5-lobed. Inner (or all) florets bisexual; corolla narrowly tubular, 5-lobed, lobes ovate, yellow to orange; anthers with apical appendage ovate and outwardly concave, tails slender, ±equal to collar, pollen pale yellow; style arms slender, with rounded, clavate, ovate, deltoid, triangular or narrowly triangular stylar appendage, yellow. Cypsela cylindrical or oblong, ~ 2.5–3.5 mm long; pericarp thick, finely striated, glabrous, surface with linear idioblasts, brown or straw- or bronze-coloured; stipe hollow, carpopodium of one row of thickened cells; apex patelliform when mature. Testa free from pericarp, cells ±equilateral, without thickening; vein passing to apex. Pappus uniseriate; bristles slender, equal to or exceeding corolla, white or yellow, consistent with the colour of the medial phyllaries, barbellate with apical cells acute and occasionally coloured red, bristles very shortly united at base and eventually deciduous as a whole or in pieces in the X. bracteatum group, or persistent in the X. milliganii group.