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An annual plant which grows in water. It can be 60-75 cm across. The leaves occur in rosettes. They are diamond shaped. The leaves have shiny pale green surfaces. The veins are easy to see. There are teeth around the edge. The leaf stalks are fleshy and spongy. They are 4-20 cm long. The fruit are heart-shaped and brown. It is a soft, juicy, fleshy receptacle.
Stem mainly submersed, to 1 m or more; blades of aerial lvs 2–5 cm wide, sharply serrate above; fls axillary, short-peduncled; pet white, 8 mm; fr 3–4 cm wide, with 4 stout horns; 2n=ca 36, ca 48. Native of Eurasia, established and becoming abundant in the Hudson, Potomac, and Mohawk rivers, and locally elsewhere in our range. June–Sept.
Annual.. Leaves with lamina often broader than long, 1.5–4.5 cm. long, 1.5–7 cm. wide, toothed in upper part, glabrous above, beneath varying from almost glabrous to densely hairy all over.. Sepals about 4–7 mm. long.. Petals obovate-oblong to obovate, about 8–16 mm. long.. Fruit very variably 2–4-horned.
Leaves with lamina often broader than long, 1·5–5 cm. × 1·5–8 cm., toothed in upper part, glabrous above, beneath varying from almost glabrous to densely hairy all over.
Petals obovate-oblong to obovate, about 8–16 mm. long.
Fruit very variably 2–4-horned.
Sepals about 4–7 cm. long.
Annual.
