Aquatic and Wetland Vascular Plants of the Northern Great Plains
9. Ranunculaceae, the Buttercup Family
4. Ranunculus L. -- Buttercup, crowfoot2. Ranunculus cymbalaria Pursh -- Seaside buttercup
Low, extensively stoloniferous perennial, often forming dense mats, 3-15(25) cm tall, glabrous or sparsely pubescent mainly on the scapes and petioles. Leaves all basal, the blades ovate to round or reniform, cordate or truncate at the base, 5-22(40) mm long, 4-20(35) mm wide, crenate to shallowly lobed, often with 3 prominent lobes at the tip. Scapes surpassing the leaves, simple or sparingly branched with 1-several small yellow flowers. Sepals 5, greenish-yellow, spreading, 3-5 mm long, deciduous; petals usually 5(-12), yellow, turning whitish with age, 3-8 mm long; stamens usually 10-30; receptacle 2-4 mm long in flower, 4-10 mm long in fruit, pubescent. Achenes usually 40-150 in a cylindric head 3-10(15) mm long, 3-4(6) mm thick; achene body turgid, cuneate-oblong, longitudinally nerved, ca. 1.5 mm long; beak triangular, straight, 0.3 mm long. Jun--Oct. Wet meadows, stream banks, shores, ditches and seepage areas, often where brackish; very common; (Throughout most of N.Amer. and S.Amer.; also Eurasia).
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