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unicorn plant

a North American plant, Proboscidea (Martynia) louisianica, having creamy-white to red flowers blotched with purple, and a woody capsule with a long, curved beak.
1790-1800 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for unicorn-plant

unicorn plant

any North American herb of the family Martyniaceae of the flowering plant order Lamiales, and particularly Proboseidea louisianica. There are nine species of unicorn plants, most having large purple or creamy white flowers

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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