Almost scentless, annual herb. Stems prostrate, ascending, or erect, 10-20-(40) cm long, striate, moderately to densely hairy, at least above, usually much-branched from base. Basal and lower cauline lvs apetiolate, obovate to oblong, sparsely to moderately hairy and glandular, 1-pinnate with segments again 1-2-pinnatisect, up to 5 cm long; ultimate segments ovate-oblong to subulate, entire, all in one plane; cauline lvs similar to basal, small and less divided near capitula, usually oblong. Involucral bracts sparsely hairy, 2-6 mm long; margins and apex of at least inner bracts membranous. Capitula solitary, c. 2-3 cm diam.; ray florets c. 12-20; ligules white; disc florets numerous, yellow. Scales present to base of receptacle, elliptic-lanceolate, acuminate. Achenes c. 2 mm long, obpyramidal, broadest at apex, square in section, pale brown, with c. 10 thickened smooth ribs; pappus 0.