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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

8. Rumex pseudonatronatus Borbas


Quite similar to R. crispus. Leaf blades oblong to oblong-lanceolate, widest near the middle, undulate to undulate-crisped, cuneate at the base. Panicle as in R. crispus; pedicels mostly 1-2X the length of the valves, swollen-jointed near the base. Valves rotund-ovate to reniform, mostly 3.5-5 mm long, about as wide, entire, lacking tubercles or with a weakly developed tubercle on one of the valves; achenes 2-3 mm long. Jun--Sep. Wet meadows, ditches, shores and other low areas, often where disturbed; common in ND, less so in SD; (Intro. from Europe and naturalized over much of the n U.S. and s Can.).

Reports of R. longifolius DC. (R. domesticus Hartm.) for the northern Great Plains are largely based on the above. Only one verified record of R. longifolius exists for this region. O. A. Stevens collected the plant in 1946 from along a railroad near Stanley, Mountrail Co., ND. It differs from R. pseudonatronatus in having larger valves (more than 5 mm wide) and broader leaves (not more than 4X longer than broad) with flat to slightly undulate margins.

GIF- Distribution Map

Map key


Previous Species -- Rumex patientia L. -- Patience dock
Return to Family -- Polygonaceae - The Smartweed Family
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