Perennial herb to 3 m tall, glabrous, glaucous. Stems branched. Leaves deeply divided, to 10 cm long. Capitula radiate, solitary, to 14 cm across; summer to autumn. Ray florets yellow. Disk florets yellowish or greenish. Pappus a short, toothed crown.
Canada, USA
R. subtomentosa Pursh, Sweet Cornflower, from central USA is a branched perennial herb with leaves often divided into 3s, capitula to 8 cm across, yellow ray florets and purplish brown disk florets.
Source: (2002). Dahlia. In: . Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.
Rudbeckia laciniata 'Golden Glow'
To nearly 2 m tall with double yellow flowers. ['Hortensia']