Oncosiphon grandiflorus (Thunb.) Källersjö

Erect, aromatic annual herb, to 0.3 (0.5) m tall; stems sparsely pilose to pilose sometimes glabrous. Leaves bipinnatisect, lanceolate to oblanceolate, 10-40 (50) x 5-20 (30) mm, pilose; lobes oblong to lanceolate, 1-5 x ±1 mm, mucronulate. Capitula discoid, homogamous, 6-15 mm diam., in simple, lax corymbs sometimes solitary; peduncles thickened toward the base of capitula, 10-80 (130) mm long, pilose, becoming densely pilose below capitula. Involucre broadly hemispherical, 5-14 mm diam., base cordate in mature heads; involucre bracts 3-seriate, slightly deflexed at anthesis, never decurrent on the peduncle, apices ± level with receptacle apex, midvein prominent sometimes inconspicuous, dark brown, tomentose sometimes sparsely tomentose, margins and apices broadly scarious; outer series ovate, ±3.5 mm long; median series bract broadly oblong to oval, 3-4 mm long; inner series narrowly oblong, ±4 mm long. Receptacle flat-convex, slightly obscured by involucral bracts. Disc florets bisexual, corolla 2-3 mm long, yellow; tube conspicuously swollen from apex to the base, ±1.5 mm long; limb campanulate, ±1.5 mm long; lobes ovate, ±0.5 mm long. Pappus inconspicuous to small, irregularly lobed, ±0.2 mm long. Flowering is from late winter to late spring (August to November).