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E. speciosus is a perennial herb which grows up to 100 centimetres (39 inches) tall, producing underground rhizomes and a woody caudex. The inflorescence generally contains 2–20 flower heads per stem. Each head contains 75–150 white, lavender or blue ray florets surrounding many yellow disc florets. Flowers bloom from June to October.The species is similar to E. subtrinervis, the stems and leaves of which are hairy.
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