View source for Rheum x hybridum.

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Rheum rhaponticum, Linn. (i. e., Pontic Rha, "Rhubarb of Pontus," a 
province of Asia Minor). Rhubarb. Pie-Plant (in the U. S.). Wine-plant. 
Fig. 3374. Strong perennial, with thick clustered roots: petioles semi- 
cylindric, plane above: lf .-blades suborbicular, deeply cordate at 
base, undulate, about 5-ribbed, glabrous and shining above, pubescent 
on the veins beneath: panicles tall and narrow, somewhat leafy, densely 
flowered, the pedicels jointed below the middle, the fls. whitish: 
achene oblong-oval. In deserts and subalpine parts of S. 
Siberia.—Nearly everywhere grown in this country for the succulent acid 
petioles or leaf-stalks, which are used in early spring for pies and 
sauces. Wine is sometimes made from the juice. In France, known usually 
as an ornamental plant. There are several garden varieties. See 
Rhubarb.
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==Cultivation==
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===Propagation===
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===Pests and diseases===
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==Species==
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==Gallery==
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==References==
*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->
<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->
<!--- xxxxx  *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608  -->

==External links==
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