This section is from the book "Cooking Vegetables. Practical American Cookery", by Jules Arthur Harder. Also available from Amazon: The Physiology Of Taste.
Rhubarbe des Moines. Rhaharber.
No. 1031. - This species is readily distinguished by its deeply divided or palmate leaves, and is the variety from which the dried root chiefly used in medicine, is obtained. The roots are thick and succulent, with a brownish skin and light yellow flesh, streaked or variegated with red. The Rhubarb from Turkey is generally preferred, but its superiority is, to a great degree, attributable to the manner in which it is dried. Like the Pie Rhubarb, it requires a deep, rich soil, and will not be ready for taking up until five years old.
 
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