Northern Prairie Wildlife Research Center


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Aquatic and Wetland Vascular Plants of the Northern Great Plains

15. Polygonaceae, the Smartweed Family

2. Rumex L. -- Dock

6. Rumex orbiculatus A. Gray -- Great water dock

Very similar to R. occidentalis, differing as follows: Basal leaf blades oblong-lanceolate, flat, acute to rounded at the base. Pedicels obscurely jointed below the middle, the joint not swollen; valves orbicular to rotund-ovate, truncate at the base, 5-8 mm long and about as wide, entire to denticulate; tubercles 3, ca. 1/2 the length of the valve, the base of the tubercle distinctly above the base of the valve. Springs, fens and fresh marshes; uncommon and scattered; (Newf. and Que. to ND, s to NJ, OH, IL, IA and NE).
GIF- Distribution Map

Previous Species -- Rumex occidentalis S. Wats. -- Western dock
Return to Family -- Polygonaceae - The Smartweed Family
Next Species -- Rumex patientia L. -- Patience dock

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