Perennial herb, up to 300 mm tall. Stems bifarious. Leaves 20-25 mm long, sparingly hairy, elliptic, lower with subacute triangular tip. Bracts large. Calyx teeth with white spreading hairs. Corolla tube up to 25 mm long. Flowers white with mauve spots.
Leaves up to 0.75-1 in. long, sparingly hairy, elliptic, lower with a subacute triangular tip; calyx-teeth with rather long several-celled white spreading hairs; otherwise as Chaetacanthus Persoonii.