Prostrate annual, forming patches up to c. 40 cm diam. Stems sparsely to densely clothed in long hairs, especially toward tips, rooting at nodes. Basal and lower cauline lvs petiolate, sheathing at base, sparsely to moderately hairy, 2-3-pinnatisect, up to 5 × 1.5 cm; primary divisions in 2-5 pairs; ultimate segments narrow-elliptic to subulate, not all in one plane giving a somewhat feathery appearance to the lf. Cauline lvs similar to basal but smaller, mostly 15 × 5-8 mm. Involucral bracts in 1-2 rows, hairy, acute to apiculate, 3-6 mm long. Capitula inconspicuous at flowering, usually scattered along stems, 4-10 mm diam. at fruiting, with (3)-5-20-(27) mature achenes and central florets usually functionally ♂. Achenes glabrous or with short hairs on both surfaces and sometimes on wings, (2.5)-3-6 × 1.3-4.5 mm (including spine), with low central rib on outer face; lateral angles not winged or with narrow to broad thin wings; wings entire or shallowly to deeply 2-lobed, rounded at apex or extended into narrow projections; spine 1.3-2.5 mm long.