Perennial herbs; upper leaves sessile, subclasping at base, shortly decurrent on stems; capitula solitary or 3 or 4 crowded at ends of stems and branches; phyllaries longer than disk florets; ray florets longer than disk florets, lamina bluish, exceeding style.
Annual herbs; upper leaves sessile or shortly petiolate, not decurrent; capitula ± numerous, in racemiform or racemose-paniculiform synflorescences; phyllaries shorter than disk florets; ray florets shorter than disk florets, lamina white, shorter than style, or tube apex obliquely lobed, elaminate
Stems moderately to densely stipitate glandular and sparsely villous; capitula 1-1.2 cm in diam., numerous, in racemiform or racemose-paniculiform synflorescences; phyllaries green, ca. 1/3 shorter than disk florets, outer shorter than inner, ± villous and densely short-stipitate glandular.
Stems densely brown glandular; capitula 1.5-2 cm in diam., few, in racemiform synflorescences; phyllaries dark brown, slightly shorter than disk florets, outer often longer than inner, densely brown glandular.