Introduced, warm-season, usually annual, hairless or pilose herb. Flowering stems are 20–60 cm tall, stout and profusely branching. Leaves with lamina ± reniform or oblate, mostly 1–3 cm long, 1.5–5 cm wide, deeply 3-lobed, segments further lobed; uppermost leaves sometimes oblanceolate and entire; petiole 3–12 cm long. Flowers are 5–10 mm wide and solitary or in cymes. Petals are 5, pale yellow; nectary surrounded by a thickened rim. Flowering is mostly in summer. Grows in wet mud and in poorly drained pasture land.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/73840284@N04">Harry Rose</a> from South West Rocks, Australia
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/macleaygrassman/14758262087/">Ranunculus sceleratus leaf2</a>