Weedy annual, glabrous or rarely hirsute, 1-5 dm tall or the stem to 10 dm long when submersed. Stems erect, inflated and hollow, sparsely to profusely branched, especially above. Leaves basal and cauline, the basal leaves often longer-petioled and less deeply dissected than the cauline ones, often floating when submersed; blades deeply 3-parted or divided, broadly truncate or cordate at the base, distally rounded, 1-6 cm long, 3-8 cm wide, the primary lobes or divisions lobed or divided, the ultimate lobes obtuse to rounded; petioles 2-15 cm long or much longer when submersed; stipular bases dilated, membranous, 5-12 mm long. Flowers numerous; sepals 5, yellowish-green, reflexed, 2-3 mm long, deciduous with the petals, glabrous; petals 5, light yellow, fading white, 3-5 mm long; stamens usually 10-25; receptacle 1.5-3 mm long in flower, 3-10 mm long in fruit. Achenes 40-300 in a cylindric-ovoid or rarely globose head 4-11 mm long, 3.5-7 mm thick; achene body obovoid, 0.8-1.2 mm long, glabrous, obscurely keeled on the margins, somewhat corky-thickened around the edges; beak minute and blunt. |
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