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From Gardenology.org - Plant Encyclopedia and Gardening Wiki
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==References==
==References==
<references/>
<references/>
*[http://www.pfaf.org/database/plants.php?Echinacea+purpurea Plants for a Future] - creative commons text incorporated
*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
*[[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 *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381 -->
